Best Clear Coat for Kitchen Cabinets: Protect and Shine

Flaking, smudges, and fading finishes can wreck freshly painted kitchen cabinets fast. Watching your hard work lose its crisp look under daily kitchen wear is beyond frustrating. The wrong clear coat might peel, yellow, or dull quicker than expected.

Rust-Oleum’s oil-based spray seals with a shiny, durable gloss that fights rust and fading. Country Chic Paint uses a low-VOC, satin water-based formula to keep colors vibrant without harsh fumes.

FamoWood’s epoxy coating fills the gap for those needing a thick, glass-like, ultra-durable finish that outlasts standard varnishes.

Effective Clear Coats to Preserve and Enhance Kitchen Cabinets

Protect painted or natural wood cabinets with durable clear coats designed to maintain finish clarity and resist daily wear, while offering ease of application and low odor.

1. Rust-Oleum Universal All Surface Clear Topcoat Spray, 11 oz, High Gloss Finish

Choosing the right finish to protect and highlight your wood surfaces can be trickier than often expected. Many sprays promise durability but fail to hold up against daily wear or maintain clarity over time. Rust-Oleum’s clear topcoat spray changes that by offering a combination of protection and shine that lasts.

Designed with an oil-based formula, this spray adheres firmly to a variety of surfaces including wood, metal, plastic, and fiberglass. Its resilience against rust, fading, and chipping means the surface preserves its look under constant exposure. The high gloss finish delivers a brilliant shine that enhances the natural beauty beneath.

The aerosol design allows for effortless application even at tricky angles, and drying to the touch within 30 minutes speeds up your project timeline. Handling areas prone to moisture or friction becomes easier with Rust-Oleum’s long-lasting protective coat, which guards against everyday damage and corrosion.

The brand’s spray offers broad coverage, approximately 15 square feet per can, making it suitable for both small refinishing jobs and larger refinishing tasks with consistent, smooth results free from streaks or runs. Its versatility extends indoors and outdoors, delivering scratch-resistant durability on cabinets, furniture, or decorative elements.

Best for: Homeowners and craftsmen looking to apply a glossy, resilient seal on wood or mixed materials in kitchen or household projects.

Pros:

• Effective adhesion on multiple surfaces
• Fast drying, reducing waiting time
• High gloss finish adds visual depth
• Protects against rust and chipping
• Convenient spray application including upside-down use

Cons:

• May require multiple cans for extensive coverage

2. Country Chic Paint Eco-Friendly Satin Sheen Top Coat for Cabinets and Furniture

Applying a sealant that remains clear and fresh without overwhelming fumes can transform your painted wood surfaces. With an ultra-low VOC formula, this coating offers a non-yellowing, satin finish that preserves the original color brilliance of your work.

Perfectly sized for small-scale projects or touch-ups, it delivers durable protection against everyday wear while being easy to apply, whether your project is in the kitchen or outdoors. The satin sheen adds a subtle glow that complements both furniture and cabinetry styles.

Country Chic Paint’s solution balances environmental mindfulness with practical functionality, reducing harsh odors often associated with similar coatings. A water cleanup feature makes post-application maintenance straightforward and safer.

Though mostly praised for its clarity and ease, be aware that application thickness can affect the final look—careful, thin layers work best to avoid uneven patches. The waterproof quality defends painted surfaces where moisture and frequent handling occur.

Experience a satin coat that safeguards your creations while maintaining their visual appeal.

Best for: Artisans and DIYers handling indoor and outdoor furniture seeking a gentle yet resilient finishing coat with minimal odor and a clear satin appearance.

Pros:

• Eco-friendly, low VOC formulation reduces chemical exposure
• Non-yellowing finish keeps colors vibrant over time
• Suitable for indoor and outdoor surfaces
• Easy water cleanup and application
• Small 4oz size perfect for touch-ups and small projects

Cons:

• May require careful application to prevent patchiness

3. General Finishes High Performance Water Based Topcoat Pint, Flat Finish, Durable Protective Sealant

Protecting wooden interiors from daily wear demands more than standard finishes. This water-based coating by General Finishes ranks as one of the most resilient options available for indoor wood surfaces.

Its fast drying time, usually between 1 to 2 hours, allows for quicker layering without long waits. The finish itself is flat, providing a subtle sheen that resists fingerprints and enhances the natural texture of wood.

The formula is specifically designed to avoid yellowing common in clear coats, making it suitable for colored surfaces, though caution is advised with bright whites. Thanks to its water-based nature, cleanup remains simple and environmentally friendlier.

General Finishes has engineered this product to offer strong protection against scuffs and scratches while preserving the wood’s character. Average coverage stretches enough for multiple projects, balancing efficiency with quality.

Durability and ease of use come together in this flat finish topcoat, ideal for refinishing kitchen cabinetry or any woodwork that faces frequent use and moisture exposure indoors.

Best for: Woodworkers and DIYers needing a hard-wearing, quick-drying sealant for indoor wooden surfaces.

Pros:

• Hardest consumer-grade water-based protective finish
• Fast drying time between coats
• Flat finish reduces fingerprint visibility
• Simple water cleanup
• Good coverage for multiple applications

Cons:

• May cause yellowing on bright white paints

4. Varathane Durable Triple Thick Polyurethane Clear Finish with Gloss Protection Quart

Applying a protective layer that dries swiftly yet delivers robust wear resistance often feels like a balancing act. Varathane’s formula stands out by offering a triple thick consistency that covers extensive surface areas with a single coat, saving time without compromising strength.

Its self-leveling characteristic minimizes imperfections and brush strokes, creating a smooth, glasslike gloss that highlights the wood’s natural charm. The water-based composition provides excellent scratch and stain resistance, suited to frequent use in interior spaces.

With a drying time of about two hours, this clear finish lets projects progress rapidly while still forming a durable protective barrier. Cleanup is hassle-free with warm water, eliminating the need for harsh solvents. Rust-Oleum’s Varathane is recognized for combining ease of application and lasting performance in one quart container.

Although named for its thickness, multiple coats may still be necessary on high-traffic surfaces to maintain superior protection. The gloss finish brings a luminous appeal, balancing wear resistance and aesthetics for indoor wooden furniture, doors, and trim.

Best for: Woodworkers and DIY enthusiasts who seek a resilient, high-gloss sealant that speeds up finishing without sacrificing surface integrity.

Pros:

• Triple thick formula covers more area in fewer coats
• Fast drying time accelerates project completion
• Strong scratch and stain resistance preserves appearance
• Water-based for easier cleanup and less odor
• Gloss finish enhances wood’s natural beauty

Cons:

• May require additional coats for heavy-use cabinetry
• Gloss level might be too shiny for some design preferences

5. Furniture Clinic Satin Water-Based Wood Varnish for Durable Indoor Protection

Protecting indoor wooden surfaces without harsh fumes often feels like choosing between safety and durability. Furniture Clinic offers a varnish that balances both with its low-VOC, water-based formula, making it easier to apply even in confined spaces like kitchens or living rooms. Its satin finish doesn’t just shield wood — it enhances the natural grains and hues, adding subtle depth to any wooden door, baseboard, or cabinet.

Designed to form a strong water-resistant seal, this coating defends against stains and everyday wear. It’s versatile enough for new wood or previously treated surfaces, maintaining protection while preserving the wood’s original character. Quick drying times speed up your project without compromising smoothness or clarity.

While multiple thin coats are recommended for the best finish, the varnish’s virtually odorless nature means less discomfort during use. Users appreciate how it avoids streaking or uneven layers, delivering a consistent satin glow that strikes a balance between shine and subtlety.

Furniture Clinic’s product suits refinishing or restoring tasks and is a reliable option for maintaining wood’s appeal over time with easy application and robust protection against liquid damage.

Best for: Homeowners restoring indoor wood surfaces like cabinets or furniture who want a combination of lasting protection and a clean satin finish with minimal fumes.

Pros:

• Low VOC and almost odor-free for safer indoor use
• Water-based formula that enhances wood grain
• Durable seal against stains and liquid damage
• Satin finish offering a balanced sheen
• Suitable for new and previously stained wood

Cons:

• May require multiple coats, with sanding between each layer, to achieve the best durability

6. Dixie Belle Durable Polyacrylic Topcoat 32oz – Water & UV Resistant Clear Finish for Cabinets

Applying a finish that stands up to everyday wear without yellowing can change how long your woodwork looks fresh. Dixie Belle’s polyacrylic topcoat offers an exceptionally hard semi-gloss shield that protects surfaces subjected to frequent use and moisture.

Designed for versatility, it bonds well to numerous bases like wood, metal, laminate, and even glass. This makes it a convenient choice for cabinet surfaces, furniture, and crafts requiring a durable coating.

Adding thin, even layers allows the product to dry efficiently, creating a resilient barrier that resists UV rays and moisture damage. The finish also facilitates easy cleaning with just soap and water, preserving the surface’s appearance over the long haul.

Dixie Belle’s formulation avoids the common downside of many finishes — unwanted yellowing — keeping colors vibrant without compromising toughness. Users benefit from a coating that is both waterproof and UV resistant, lending longevity to high-traffic areas.

Included instructions recommend up to three light coats using recommended tools for a smooth application and solid surface protection. While full curing takes about two days, the end result is a tough finish suited to home restoration and upkeep projects.

Best for: Homeowners aiming to protect frequently used cabinetry or furniture with a clear, resilient, and non-yellowing protective finish.

Pros:

• Provides a rock-hard, semi-gloss finish
• Non-yellowing, maintains color clarity over time
• Waterproof and resistant to UV damage
• Adheres to various surfaces including wood and metal
• Easy cleaning with mild soap and water after curing

Cons:

• Full cure time may take up to 48 hours for maximum durability

7. FamoWood Gallon Kit High-Gloss Clear Epoxy Coating for Indoor Surfaces

Protecting and beautifying kitchen surfaces often requires more than traditional varnishes. This FamoWood epoxy coating delivers a durable, glass-like finish with just one pour that equals dozens of layers of ordinary varnish. Its self-leveling formula reduces the effort of spreading, forming smooth, even coats on cabinets and furniture.

Designed for indoor use, the product stands up to household temperatures up to 120 °F, ensuring your surfaces stay pristine under normal kitchen conditions. The easy-to-mix, 1:1 ratio epoxy simplifies preparation, making it manageable even if you’re handling smaller craft or home improvement projects.

Its high-gloss, crystal-clear shine enhances wood grain and painted finishes alike, highlighting your cabinetry’s natural appeal. The versatility to work on any non-waxy substrate broadens your finishing options, whether sealing stained wood or decorative items embedded in the surface.

The brand encourages precise mixing and application techniques to minimize bubbles, with heat gun use recommended to achieve a flawless, smooth coat. Cleaning preparation and layered sealing can improve results when applied over porous or unfinished wood—a step taken by many professionals and skilled DIYers.

FamoWood epoxy combines toughness with aesthetic finesse, delivering a vibrant, long-lasting protective finish for your kitchen cabinets.

Best for: Homeowners wanting a deep, glossy, and resilient protective layer for indoor wooden or painted surfaces.

Pros:

• High-gloss finish rivaling multiple varnish coats
• Simple 1:1 mixing ratio eases application
• Self-leveling to reduce brush marks and uneven areas
• Heat resistant up to 120 °F, suitable for kitchen use
• Works on various surfaces excluding waxy materials

Cons:

• May require heat gun treatment to eliminate bubbles

8. Minwax 1 Gal Clear Polycrylic Satin Water-Based Protective Finish for Wood

Protecting your kitchen cabinetry without altering the wood’s natural tone can be unexpectedly challenging. Many finishes either yellow with time or require extensive ventilation due to strong odors. Minwax’s polycrylic protective finish handles these issues by offering a crystal-clear, non-yellowing satin coat that preserves the true look of wood surfaces like maple and birch.

Crafted for both oil- and water-based stained wood, Minwax’s formula dries quickly, allowing for recoating within just two hours, which helps you finish projects without long waits. Cleanup is straightforward with just soap and water, making maintenance practical in busy kitchens.

The satin sheen adds a subtle, modern glow that complements cabinetry aesthetics without overpowering the grain’s natural beauty. It also acts as a robust shield against scratches, spills, and household chemicals, essential protection in high-use areas.

Applying with a synthetic bristle brush ensures even coverage. Regular sanding between coats promotes adhesion and smoothness, enabling three layers to form a tough yet delicate barrier. Minwax’s reputation for durability supports its inclusion in any refinishing or refurbishing task involving interior woodwork.

Best for: Homeowners upgrading kitchen or furniture surfaces who want a fast-drying, clear satin protective finish that won’t yellow or add odor.

Pros:

• Ultra-fast drying and recoat time
• Non-yellowing, crystal-clear satin finish
• Compatible with both water- and oil-based stains
• Resistant to scratches, scuffs, and household chemicals
• Easy soap-and-water cleanup

Cons:

• May require careful application to avoid brush marks or bubbles

9. EcoProCote Eco-Poly Water-Based Polyurethane Floor Sealer Matte Finish 1 Gallon

Protecting wooden and concrete surfaces from wear and moisture challenges many projects, especially in high-use areas. EcoProCote Eco-Poly offers a superior barrier to scratches, cracks, and water damage, extending the life of your surfaces without the common strong odors of traditional finishes.

With its water-based formula featuring plant-derived resins, the product provides a safer application experience and reduces environmental impact, a rare combination in sealants that often contain harsh chemicals. The matte finish delivers a subtle, natural look that avoids unwanted shine while still protecting against UV fading.

For users seeking fast results, the quick-drying quality accelerates your project timeline. The finish is easy to apply and nearly odorless, making it practical for both indoor environments like kitchens and outdoor uses such as decks or furniture.

Its versatility covers a wide range of surfaces—wood, concrete, masonry—offering multi-layer durable protection without compromising the aesthetic appeal of the natural grain. EcoProCote’s finish also resists dust accumulation better than some other matte coatings, balancing appearance and maintenance needs effectively.

Best for: Homeowners and craftsmen needing a non-toxic, fast drying, and weather-resistant poly sealer that protects cabinets, floors, and outdoor wooden surfaces.

Pros:

• Strong resistance to scratches, cracks, and moisture
• Low odor with plant-based, eco-friendly composition
• Quick-drying for faster project completion
• UV protection to prevent fading
• Matte finish with natural appearance

Cons:

• Application can be tricky on vertical or intricate items due to runny consistency
• Matte finish may attract dust more than glossier alternatives

10. ZAR Oil-Based Polyurethane Wood Finish Quart with Glossy Toughness and Smooth Leveling

Finding a top-performing coating that balances rapid drying with high durability often proves tricky in indoor woodworking projects. ZAR’s oil-based polyurethane offers a fast-drying formula that levels itself smoothly, avoiding the usual brush marks that plague many finishes.

Designed for interior wood, this formula creates a tough, abrasion-resistant layer ideal not only for cabinets but also hardwood floors and furniture, making it a practical choice for various surfaces in high-traffic areas. It also enhances the wood’s natural grain, slightly deepening the color for a richer, inviting look.

With its claimed 2-hour drying time, you can achieve a quick recoat and finishing schedule. Application is forgiving, even for less experienced hands, thanks to the self-leveling properties that minimize bubbles and uneven sheen.

Though primarily glossy, this product has a faint umber tint that could affect lighter stains, yet provides a desirable depth and warmth that many woodworkers appreciate. The brand ZAR brings decades of refinement into this blend, making it a favorite for those seeking longevity combined with ease of use.

Best for: Woodworking enthusiasts aiming for a resilient, visually enhancing protective finish on cabinets and hardwood interiors.

Pros:

• Rapid drying with a dry-to-handle time in about two hours
• Tough resistance against abrasion and wear
• Self-leveling property creates a smooth, brush-mark-free finish
• Enriches wood grain color for added depth
• Versatile use suitable for multiple interior wood surfaces

Cons:

• Contains a faint umber tint that may impact light-colored finishes

Key Specs Compared: Top Best Clear Coat For Kitchen Cabinets

Product Name	Type & Base	Coverage / Volume	Finish & Sheen	Drying / Cure Time
Rust-Oleum Universal Clear Topcoat Spray	Oil-based spray	15 sq ft / 11 oz	High gloss, clear	Touch dry in 30 minutes
Country Chic Paint Clear Satin Coat	Water-based liquid	4 oz	Satin sheen, non-yellowing	Not specified
General Finishes High Performance Topcoat	Water-based liquid	125-150 sq ft / 16 oz	Flat finish, interior use	Recoat in 1-2 hours
Varathane Triple Thick Polyurethane	Water-based liquid	50 sq ft / 32 oz	Gloss finish, durable	Touch dry in 2 hours
Furniture Clinic Wood Varnish	Water-based liquid	129 sq ft / 8.5 oz	Satin finish, low VOC	Dries fast, sanding between coats
Dixie Belle Gator Hide Polyacrylic	Water-based liquid	30 sq ft / 32 oz	Semi-gloss, non-yellowing	Full cure 48 hours
FamoWood Glaze Coat Kit Epoxy	2-part Epoxy liquid	1 gallon (approx 36 sq ft)	High gloss, pour-on	Dry to touch in 72 min, slow cure
Minwax Polycrylic Protective Finish	Water-based liquid	Not specified / 128 oz	Satin sheen, non-yellowing	Recoat in 2 hours

How to Pick the Right Clear Coat for Your Kitchen Cabinets?

Choosing the correct clear coat makes all the difference in durability and appearance. Each formula offers unique protection, sheen, and application methods that affect your cabinets’ lifespan and style.

Base Type: Oil-Based vs Water-Based vs Epoxy

The base type defines the chemical makeup and performance of the clear coat. Oil-based coatings deliver strong adhesion and a rich look but often emit stronger odors and take longer to dry. Water-based products dry faster and have lower VOC emissions but sometimes lack the same toughness. Epoxy finishes create an exceptionally hard, thick layer that is resistant to heat and moisture.

Rust-Oleum’s oil-based spray provides excellent durability on wood and metal. General Finishes and Minwax offer water-based finishes ideal for reducing odor and speeding up recoat times. FamoWood’s epoxy cure creates a glass-like barrier that withstands kitchen moisture and heat.

Picking the base that matches your work environment and skill level prevents issues like yellowing, cracking, or peeling over time.

Sheen Level and Aesthetic Impact

Sheen affects how light reflects off the cabinet surface and alters the visual texture. High gloss creates a mirror-like shine that highlights wood grain and adds brightness. Satin and semi-gloss offer subtle glow with softer reflections, hiding minor imperfections. Flat or matte finishes dampen shine for a modern, understated look that resists fingerprints.

Rust-Oleum and FamoWood provide a high gloss finish that intensifies color depth and adds shine. Country Chic Paint and Furniture Clinic offer soft satin sheens that preserve subtlety. General Finishes’ flat finish helps reduce glare in busy kitchens.

Ignoring sheen preference may result in cabinets that look too shiny, too dull, or emphasize flaws more than intended.

Durability and Wear Resistance

Kitchen cabinet finishes need to handle scratches, heat, moisture, and cleaning chemicals without failing. A durable clear coat builds a strong, protective film that lasts through everyday wear and tear.

Varathane’s triple thick polyurethane delivers a tough, scratch-resistant surface. Dixie Belle’s polyacrylic topcoat stands up well to moisture and UV exposure, helping prevent yellowing. For extreme hardness and chemical resistance, FamoWood epoxy outperforms many standard varnishes.

Using finishes with lower durability often means peeling, damage, or frequent refinishing, which can wear down your cabinets and add extra maintenance over time.

Drying Time and Application Ease

Drying time plays a big role in how long a finishing project takes and how easily you can apply multiple coats. Faster drying means less waiting and fewer chances for dust to settle, which helps keep the finish smooth.

For example, Rust-Oleum spray dries to the touch in under 30 minutes, making it great for quick projects. General Finishes takes 1-2 hours, allowing several coats in one day. On the other hand, FamoWood epoxy needs careful mixing and a longer cure time, but it self-levels to create a very smooth surface.

Ignoring proper drying can lead to problems like tacky surfaces, bubbles, or uneven finishes, which harm your cabinets’ look. Picking the right product with a drying time that fits your schedule makes the whole process easier and improves the final result.

VOC Levels and Indoor Safety

Volatile Organic Compounds (VOCs) are chemicals released by many clear coats that affect indoor air quality. When working inside, especially in kitchens with limited ventilation, low VOC levels are safer and cause less discomfort.

Clear coats like Country Chic Paint and Furniture Clinic offer ultra-low VOC formulas that reduce harmful fumes. In contrast, oil-based and epoxy finishes tend to emit higher VOC amounts, making proper ventilation or protective gear necessary during application.

Using a high-VOC product without proper care can lead to headaches, nausea, and persistent chemical odors, impacting your comfort long after finishing the job.

Coverage and Quantity

Coverage shows how much surface a product can protect with one container. This affects both cost and waste, especially on bigger jobs where you need enough product to get the job done without stopping.

General Finishes offers about 150 sq ft per pint, which cuts down on how many cans you’ll need. Varathane provides quart sizes covering 50 sq ft but with thicker coats that build up durability. For large projects, FamoWood sells gallon kits that help tackle big areas without constant refills.

Choosing a product with too little coverage means either reapplying often or buying extra stock, which can slow your project and add unnecessary expense.

Non-Yellowing and Clarity Over Time

A clear, non-yellowing finish keeps cabinets looking fresh and true to their original color. Many oil-based finishes tend to yellow as they age, which can dull the wood’s natural brightness and change its tone.

Country Chic Paint and Dixie Belle topcoats are designed to stay clear and resist yellowing, maintaining cabinet clarity for years. Minwax Polycrylic also offers a crystal-clear coat that protects without altering color.

Picking a finish that resists yellowing helps cabinets hold their original look longer, cutting down on the need for early refinishing and preserving your kitchen’s appeal.

Frequently Asked Questions

Can I apply clear coat directly over painted cabinets?

Applying a clear coat directly over painted cabinets depends on the paint type and surface preparation. Clear coats work best on fully cured, compatible paints without dust or grease. This practice extends the protection and durability of the paint layer.

Water-based clear coats often pair well with latex paints, while oil-based clear coats complement oil-based paints better. Proper sanding ensures adhesion and reduces brush marks.

Always test a small hidden spot to check for reactions. Avoid applying clear coat too soon after painting, which can cause bubbling or peeling.

How many coats of clear coat should I apply on kitchen cabinets?

Applying at least two to three coats typically provides enough protection for kitchen cabinets against daily wear and moisture. Multiple layers build a thicker barrier, increasing durability and resistance to scratches.

Drying times between coats vary by product but are critical to prevent trapping solvents or bubbles. For example, water-based finishes allow recoating within 1-2 hours, while epoxy requires longer curing.

Use fine sanding between coats to promote adhesion and achieve a smooth final surface free from imperfections.

What sheen level is best for kitchen cabinets?

Satin and semi-gloss sheens are often preferred for kitchen cabinets as they balance shine and conceal minor surface flaws. These finishes offer a slight glow that brightens spaces without harsh reflections.

High gloss is suitable for highlighting wood grain and achieving a modern look but will show fingerprints more readily. Flat finishes hide imperfections but may appear dull in high-traffic kitchens.

Choosing sheen should match your kitchen’s style and your willingness to clean fingerprints or scratches regularly.

Does a water-based clear coat yellow over time?

Most modern water-based clear coats are formulated to resist yellowing or color shifts over time. This attribute is important for preserving the original wood tone and paint colors on cabinets.

Products like Country Chic Paint and Dixie Belle are designed to stay crystal clear. Some lower-quality water-based finishes without UV protection might develop slight discoloration in sun-exposed areas.

When selecting a water-based finish, check for non-yellowing claims and consider applying a UV protective topcoat if sunlight exposure is high.

Can I use spray clear coats instead of brush-on for kitchen cabinets?

Spray clear coats can provide faster and more even application, especially on intricate cabinet details. They reduce brush marks and speed drying times but require good ventilation and careful technique to avoid runs or overspray.

Rust-Oleum’s spray offers an oil-based formula that adheres firmly and dries quickly, ideal for quick projects. Brush-on water-based finishes give more control but may require more time to apply evenly.

Practice spraying on a test surface first and use thin, multiple coats to avoid drips. Proper masking protects surrounding areas from overspray.

Choosing the Right Clear Coat Transforms Your Kitchen Cabinets

Protective finishes stop fading, peeling, and yellowing that ruin kitchen cabinet surfaces. Picking the right clear coat changes how long your cabinets stay fresh and vibrant under heavy use. Durability, clarity, and ease of application matter most for lasting beauty.

Oil-based sprays like Rust-Oleum suit those who want high gloss and strong adhesion. Water-based satin finishes fit well for low odor and quick drying needs. Epoxy coatings are the go-to for ultra-hard, glass-like protection in busy kitchens.

Applying your finish with care, matching sheen preference, and allowing full cure times will protect your work. Test small areas and work in ventilated spaces to avoid issues with fumes or improper drying.

Last update on 2026-04-09 / Affiliate links / Images from Amazon Product Advertising API