Best Sealer For Plywood: Top 9 Picks

Large or multi-phase plywood projects often require flexibility in coverage and storage. A concentrated sealer allows you to mix only what you need, reducing waste and saving space.

Rain Guard Wood Sealer Concentrate SP-8001 is a water-based, low-odor formula that provides a clear, natural finish. Its mix-to-size approach is ideal for those who want control over application amounts and prefer a product that’s easy to store.

• Concentrated Formula: Mixes to desired quantity for efficient use and storage
• Low Odor, VOC-Conscious: Suitable for indoor or outdoor projects with minimal fumes
• Versatile Application: Works on decks, fences, siding, and furniture

Compared to ready-to-use sealers, this product prioritizes flexibility and storage efficiency. The main tradeoff is the extra step of mixing before application.

Wood near water—like docks, decks, or retaining walls—faces unique challenges from constant moisture and salt exposure. A marine-grade sealer is essential for these demanding environments.

Seal-Once Marine Penetrating Wood Sealer is formulated for maximum protection in wet, waterside, or even over-water settings. It's ideal for anyone maintaining wood near lakes, rivers, or oceans, and is also safe for aquatic life and pets.

• Marine-grade formula: Shields against saltwater, UV, and water damage
• Ultra-low VOC: Safer for people, pets, and the environment
• Cellular-level penetration: Creates a flexible, breathable barrier Unlike standard outdoor sealants, this product prioritizes long-term durability in extreme moisture. The tradeoff is that it may be more than most homeowners need for typical backyard projects.

Outdoor projects often involve more than just wood—think patios, brick, or concrete. A multi-surface sealant is perfect for homeowners looking to protect a variety of materials with one product.

Thompson’s WaterSeal Multi-Surface Waterproofer stands out for its ability to waterproof not just wood, but also concrete and brick. It's a strong choice for anyone tackling mixed-material outdoor spaces or who wants a single solution for multiple surfaces.

• Multi-surface compatibility: Works on wood, concrete, and brick
• Fade-resistant finish: Maintains appearance through sun and weather
• Easy to apply: Suitable for both new and existing projects Compared to wood-only sealers, this product prioritizes flexibility and coverage across different materials. The tradeoff is that it may not offer the same level of wood grain enhancement as specialized wood oils.

Small plywood projects in high-traffic or exposed locations—like outdoor furniture or swing sets—need targeted protection. A quart-sized, penetrating sealer is ideal for these focused applications.

Seal-Once Nano Penetrating Wood Sealer offers a water-based, odorless formula that creates a flexible, water-resistant barrier. It’s well-suited for spot treatments or smaller jobs where durability and easy cleanup matter.

• Compact Quart Size: Ideal for small projects or touch-ups
• Odorless, Low VOC: Comfortable for use in enclosed or family spaces
• Penetrating, UV-Stable Barrier: Protects against wear and weathering

Compared to gallon-sized or multi-surface sealers, this product prioritizes convenience and targeted use. The tradeoff is less coverage for larger projects.

Outdoor plywood in high-traffic areas—such as decks, fences, or play structures—needs a sealer that can withstand both the elements and frequent use. Combining polyurethane with a penetrating formula offers enhanced durability.

Seal-Once NANO+POLY Penetrating Wood Sealer delivers a water-based, low-VOC solution that penetrates deeply while adding a protective polyurethane layer. This makes it ideal for surfaces that see heavy wear and exposure.

• Polyurethane-Enhanced Protection: Resists wear and tear in busy outdoor spaces
• Low-VOC, Water-Based: Safer for home use and easy to clean up
• Flexible, Breathable Barrier: Allows wood to age naturally while staying protected

Unlike basic sealers, this product focuses on longevity and resilience in demanding environments. The main tradeoff is that the polyurethane layer may not be necessary for low-traffic or decorative applications.

For many homeowners, ease of use is a top priority when sealing plywood. A ready-to-use formula saves time and reduces the risk of mixing errors, making it ideal for quick projects or first-time users.

Rain Guard Water Sealers Wood Sealer offers a straightforward, low-odor application with a clear, natural finish. It’s suitable for a variety of indoor and outdoor wood projects, providing reliable water repellency without added complexity.

• Ready-to-Use Formula: No mixing required, just apply directly from the container
• Low-Odor and VOC-Conscious: Comfortable for home use with minimal fumes
• Weather-Resilient Barrier: Helps wood withstand moisture and everyday outdoor exposure

Compared to concentrates or multi-step products, this sealer prioritizes simplicity and user-friendliness. The tradeoff is that it may not offer the specialized features of marine or food-safe options.

Protecting cedar posts in gardens, pet enclosures, or areas with chemical sensitivity calls for a truly safe sealer. This product addresses those needs with a plant-based, food-safe formula and a natural citrus scent.

Seal It Green Garden Box Sealer is ideal for families, gardeners, and pet owners who want maximum safety and minimal environmental impact. Its professional-grade protection and U.S.-made quality make it a standout for sensitive applications.

• FDA food contact safe: Suitable for vegetable gardens and pet areas
• Covers up to 400 sq. ft.: Efficient for medium projects
• Natural citrus scent: Indicates plant-based ingredients and avoids petroleum chemicals

Compared to traditional sealers, this option is focused on health and sustainability. The main tradeoff is that it is not designed for large-scale deck or fence projects.

Painted plywood requires a sealer that won’t alter its appearance while still providing moisture protection. Standard wood sealers may not bond well or could change the paint’s finish.

Rain Guard Paint Sealer Concentrate is formulated for painted surfaces, offering a clear semi-satin finish that preserves color and texture. Its concentrated formula allows for efficient mixing and broad coverage.

• Designed for Painted Surfaces: Maintains paint appearance while adding protection
• Clear Semi-Satin Finish: Enhances aesthetics without changing color
• Concentrated, Value-Focused: Mixes to cover large areas efficiently

Compared to wood-only sealers, this product prioritizes compatibility with painted plywood. The tradeoff is that it’s not intended for raw wood or food-contact applications.

Plywood used as a substrate for floors or countertops often needs a vapor barrier to prevent moisture migration and ensure a strong bond with epoxy coatings. Standard wood sealers may not provide the required adhesion or protection.

Stone Coat Countertops Moisture Seal Epoxy Primer Kit is designed as a vapor blocker, making it ideal for prepping plywood before applying epoxy finishes. It offers deep penetration and a durable bond, especially for garage floors or countertop projects.

• Vapor-Blocking Epoxy Primer: Prevents moisture damage and supports strong epoxy adhesion
• Durable, Fast-Drying Finish: Withstands light traffic quickly and fully cures in days
• Generous Coverage: Suitable for large surfaces like floors and countertops

Compared to traditional wood sealers, this product is specialized for use under epoxy. The tradeoff is that it’s not intended for general wood sealing or outdoor weatherproofing.