Top 7 Best Waterproofing For Pressure Treated Wood

Richard Shafer | 04-02-2026

Pressure treated wood is a popular choice for outdoor projects, but exposure to rain, sun, and humidity can still cause it to warp, crack, or discolor over time. Without proper waterproofing, even treated wood can deteriorate, leading to costly repairs and shorter lifespans for decks, fences, and garden beds.

The right waterproofing product protects your investment and keeps your outdoor spaces looking their best. In this guide, we break down the top sealers and stains for pressure treated wood, comparing clear, tinted, and eco-friendly options. Whether you need a quick spot treatment or a solution for a large deck, you’ll find the best fit for your needs below.

Editor's Choice
OLYMPIC WaterGuard 5 gal. Clear Exterior Wood Sealer
OLYMPIC WaterGuard 5 gal. Clear Exterior Wood Sealer
Premium Pick
Thompson’s WaterSeal Transparent Stain Natural Cedar
Thompson’s WaterSeal Transparent Stain Natural Cedar
Budget Pick
Shabebe Garden Box Sealer Plant-Based
Shabebe Garden Box Sealer Plant-Based

Our Top 7 Best Waterproofing For Pressure Treated Wood Recommendation

To save you time and guesswork, we researched and compared top-rated Waterproofing For Pressure Treated Wood products and selected the best options available today.

1. OLYMPIC WaterGuard Clear Sealer Spray

Best for Quick Spot Treatments
OLYMPIC WaterGuard Clear Sealer Spray
8.3

Olympic

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Protecting acacia wood from water and sun damage is essential, especially for high-traffic or exposed areas. A spray-on sealer like this is ideal for those who want a fast, convenient way to add a protective layer without complex application steps.

This OLYMPIC spray is ready to use and works on new, weathered, or previously stained wood. It's a practical choice for homeowners needing to quickly seal small surfaces, outdoor furniture, or touch up worn spots. Its ease of use and simple cleanup make it especially appealing for busy families or those new to wood care.

  • Spray Application: Allows for fast, even coverage on small or irregular surfaces
  • Water and UV Protection: Shields acacia wood from moisture and sunlight to prevent damage
  • Soap and Water Cleanup: Makes post-project cleaning straightforward and safe

Compared to brush-on or oil-based sealers, this spray prioritizes convenience and speed. However, it may not offer the deep penetration or long-term durability of heavier-duty formulas, making it best for spot treatments or lighter use.

Strength
  • Easy spray application
  • Works on new and weathered wood
  • Repels water effectively
  • Provides UV protection
  • Simple cleanup
Weakness
  • Not for large projects
  • Less durable than oil-based options

2. OLYMPIC WaterGuard Clear Exterior Sealer 1 Gallon

Best for Standard Home Projects
OLYMPIC WaterGuard Clear Exterior Sealer 1 Gallon

Routine maintenance of decks, fences, and outdoor furniture requires a reliable, easy-to-use sealer. A clear, water-based formula is often preferred for its simplicity and broad compatibility.

OLYMPIC’s WaterGuard gallon-size sealer is a practical choice for standard home projects. It’s ready to use, cleans up easily, and covers a wide range of exterior wood surfaces.

  • Water-based formula: Allows for easy soap-and-water cleanup
  • Broad surface compatibility: Works on new, weathered, or pressure-treated wood
  • UV and water resistance: Helps prevent fading and moisture damage

Compared to specialty or color-tinted products, this sealer focuses on straightforward protection for typical home needs. The tradeoff is that it doesn’t offer color enhancement or advanced specialty features.

Strength
  • Covers large areas
  • Easy cleanup
  • Works on various wood types
  • UV protection
  • Ready to use
Weakness
  • No color options
  • Basic protection only

3. OLYMPIC WaterGuard 5 gal. Clear Exterior Wood Sealer

Best for Large Coverage Needs
OLYMPIC WaterGuard 5 gal. Clear Exterior Wood Sealer
9.8

Olympic

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Large decks, fences, or multiple outdoor structures require a waterproofing solution that can handle extensive coverage without frequent reapplication. A bulk-size sealer is the most efficient way to protect big projects from weather damage.

The OLYMPIC WaterGuard 5-gallon Clear Exterior Wood Sealer is designed for homeowners or professionals tackling sizable jobs. Its generous volume and easy soap-and-water cleanup make it a practical choice for those with ongoing maintenance needs.

  • High Volume: 5 gallons covers up to 1,750 sq. ft. (350 sq. ft. per gallon)
  • Water-Based and Low Odor: User-friendly for large, open projects
  • Multi-Surface Compatibility: Works on decks, fences, siding, and more

Compared to smaller containers, this option minimizes cost per square foot and reduces the need for frequent purchases. The main tradeoff is storage space and handling bulkier packaging.

Strength
  • Excellent value for large projects
  • Covers multiple surfaces
  • Water-based for easy cleanup
  • UV and water protection
  • Suitable for professionals
Weakness
  • Heavy and bulky to store
  • Not practical for small jobs

4. Thompson’s WaterSeal Transparent Stain Natural Cedar

Best for Easy Damp-Wood Application
Thompson’s WaterSeal Transparent Stain Natural Cedar
9.5

Thompson's

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Applying a wood sealer to damp surfaces is often tricky, but sometimes waiting for perfect weather isn't practical. This transparent stain is formulated to be applied to both damp and dry wood, making it convenient for unpredictable conditions.

Thompson’s WaterSeal Transparent Stain is a great fit for homeowners who want flexibility in their project timing. Its fade-resistant finish protects against UV rays and water damage, while the transparent color adds a subtle tint without hiding wood texture.

  • Damp or dry application: No need to wait for perfect weather
  • Fade-resistant polymers: Maintains color and UV protection
  • Meets waterproofing standards: Exceeds ASTM D-4446 for wood protection

Compared to products that require dry wood, this stain is more forgiving for quick projects. The tradeoff is that it may not offer as many color options or finishes as some specialty sealers.

Strength
  • Apply to damp or dry wood
  • Fade-resistant color
  • Transparent finish shows texture
  • Exceeds industry waterproofing standards
  • Easy to use
Weakness
  • Limited color choices
  • Not a heavy-duty marine sealer

5. Shabebe Garden Box Sealer Plant-Based

Best Non-Toxic Formula for Gardens
Shabebe Garden Box Sealer Plant-Based
8.7

Shabebe

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Outdoor acacia wood structures like garden beds and planters need protection from moisture and sun, but many sealers contain chemicals that aren't safe for plants or pets. A plant-based, non-toxic formula is essential for these uses.

Shabebe's sealer is designed for garden projects, offering deep penetration and long-lasting durability without harsh fumes or synthetic solvents. It's a smart choice for eco-conscious families and anyone sealing wood near edible plants or animals.

  • Plant-Based Ingredients: Free from synthetic solvents and strong odors
  • Long-Lasting Protection: Bonds with wood for extended outdoor durability
  • Easy Application: Brush, roll, or spray with quick drying between coats

Compared to traditional outdoor sealers, this product prioritizes safety for gardens and pets. The tradeoff is that it's not recommended for laminated or coated wood, so it's best for untreated, natural surfaces.

Strength
  • Safe for gardens and pets
  • No harsh fumes or chemicals
  • Good value for large projects
  • Covers a wide area
  • Quick drying between coats
Weakness
  • Not for laminated wood
  • Requires clean, bare surface

6. Thompson's Semi-Transparent Stain Chestnut Brown

Best for Adding Tinted Color Protection
Thompson's Semi-Transparent Stain Chestnut Brown
8.5

Thompson's

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Some outdoor wood projects benefit from a hint of color that still allows the natural texture to show. Semi-transparent stains offer a balance between protection and visual enhancement.

This Thompson's WaterSeal is well-suited for decks, fences, or siding where a lightly tinted finish is desired. It’s easy to apply and provides year-round protection against water and UV damage.

  • Semi-transparent tint: Adds subtle color while maintaining wood texture
  • UV and water resistance: Protects surfaces from fading and moisture
  • ASTM D-4446 compliant: Meets industry standards for waterproofing

Compared to clear or fully transparent sealers, this product prioritizes color with a natural look. The tradeoff is that it may not suit those who want a completely invisible finish.

Strength
  • Lightly tinted color
  • Protects against water and sun
  • Easy to apply
  • Maintains wood texture
  • Long-lasting protection
Weakness
  • Color may not suit all tastes
  • Not fully clear

7. Thompson’s WaterSeal Solid Color Stain Sedona Red 1 Gal

Best for Full-Color Coverage
Thompson’s WaterSeal Solid Color Stain Sedona Red 1 Gal
8.3

Thompson's

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When you want to completely transform the look of your outdoor wood while ensuring waterproof protection, a solid color stain is the way to go. This type of product is perfect for covering imperfections or creating a bold, uniform appearance.

Thompson’s WaterSeal Solid Color Stain in Sedona Red offers strong color coverage and reliable weatherproofing. It's best for decks, fences, or furniture where a dramatic color change or full coverage is desired.

  • Solid Color Finish: Hides wood grain for a consistent, bold look
  • UV and Water Protection: Shields wood from sun and moisture
  • Easy Application: Can be used on damp or dry wood

Compared to transparent or semi-transparent options, this product prioritizes appearance and coverage. The tradeoff is that it will fully mask the natural wood grain.

Strength
  • Full color coverage
  • Protects against water and UV
  • Can be applied to damp wood
  • Easy to clean up
  • Good for hiding flaws
Weakness
  • Completely hides wood grain
  • Color selection is limited

Buying Guide: How to Choose the Best Waterproofing for Pressure Treated Wood

Waterproofing pressure treated wood is a technical process that protects against moisture, sun, and wear. Buyers often face tradeoffs between ease of use, coverage, finish type, and safety—especially for gardens or food-related projects. Many assume all sealers are the same, but differences in formula, application, and suitability can impact results.

Choosing Between Clear Sealers and Stains

The main decision is whether you want to preserve the wood's natural look or add color. Clear sealers are best for those who prefer a natural appearance, while stains (transparent, semi-transparent, or solid) offer varying levels of color and coverage. Consider how much of the wood grain you want to see and whether you need to hide imperfections.

Sizing Up: Bulk Containers vs. Spot Treatments

For large decks, fences, or multiple structures, buying in bulk saves money and reduces trips to the store. Smaller containers or sprays are ideal for quick repairs, small projects, or hard-to-reach areas. Match the container size to your project's scale to avoid waste or running short.

Prioritizing Safety: Non-Toxic and Food-Safe Formulas

If you're sealing garden beds, planters, or any wood near food or pets, choose a non-toxic, plant-based formula. These are designed to be safe for edible plants and animals, but may not adhere well to laminated or painted surfaces. Always check product compatibility with your specific wood type.

Application and Weather Conditions

Some waterproofers can be applied to damp wood, which is helpful in humid or rainy climates. This flexibility can save time and prevent delays. However, always follow the manufacturer's directions for best results, and ensure surfaces are clean and free of old coatings.

Finish and Durability Considerations

Flexible, crack-resistant finishes are important in climates with temperature swings, as they prevent peeling and extend protection. Solid color stains offer the most coverage and hide flaws, while transparent options highlight natural wood. Be aware that more color often means less visible grain.

Final Buying Advice

Choosing the right waterproofing product depends on your project's size, location, and safety needs. Match the formula and finish to your intended use for the best results.

FAQ For Waterproofing For Pressure Treated Wood

1. Can I use a clear sealer on previously stained pressure treated wood?

Yes, most clear sealers can be applied over weathered clear or semi-transparent stains, but ensure the surface is clean and free of loose coatings.

2. Is it safe to use standard wood sealers on garden beds?

For garden beds, choose a non-toxic, plant-based sealer labeled as safe for food contact to avoid chemical leaching into soil.

3. How often should I reapply waterproofing to pressure treated wood?

Reapplication frequency depends on product type and exposure, but most outdoor wood benefits from resealing every 1–3 years.

4. Can I apply waterproofing products to damp wood?

Some products are designed for damp or dry application, but always check the label and ensure the wood is clean for best results.

5. What is the difference between transparent, semi-transparent, and solid stains?

Transparent stains add a hint of color while showing wood texture, semi-transparent stains add more color but still show grain, and solid stains provide full coverage, hiding most of the grain.

6. Do I need to sand pressure treated wood before applying a sealer or stain?

Sanding is not always required, but cleaning and removing loose material ensures better adhesion and longer-lasting protection.

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