10 Best Outdoor Wood Sealer of December 2025

• Will effectively seal any porous material against damage by water, including concrete, brick, stone, plaster, wood, and asbestos
• When used as an additive to, or under-seal for solvent thinned paints, it shields paint against weather.
• Is unsurpassed as a penetrating sealer for concrete hardening and dust-proofing, and meets ASTM C309 specifications for concrete curing
• Clear waterproofer
• 10100: 12 oz aerosol

Thompsons

• Repels moisture as it enhances wood's natural beauty. Protect your outdoor furniture from mother nature and protect your investment.
• Repels common outdoor stains, making cleanup easier. No need to worry about the occasional spill during a backyard barbecue, or popsicles on a hot summer day.
• Forms and invisible barrier against mold, mildew and fungi, keeping your outdoor furniture looking its best and providing you with an inviting outdoor living space.
• Great for all types of wood - including teak and cedar.
• Guardsman Outdoor Wood Protector forms a micro-thin film to prevent mildew and fungi spores form attaching to the treated surfaces.

Guardsman

• Prevents Water Damage
• Advanced Polymers Provide Fade Resistant Color
• Coating Resists Mildew and UV Damage
• Applies to Freshly Cleaned Damp or Dry Wood
• Exceeds Industry Standard ASTM D-4446 for Waterproofing Wood

Thompson's Water Seal

• Ideal for use on interior/exterior surfaces including plaster, masonry, wood, metal and unglazed ceramic
• Acrylic formula offers an ultra-hard, high luster finish with fast cure and hardening time compared to regular paint
• Dries to the touch in 20 minutes, covers up to 7 sq. ft. per can
• Durable coating can sanded and recoated for a higher gloss finish
• Provides a smooth, ultra gloss coating for a professional, factory finish look

Rust-Oleum

• Ideal for use on exterior wood surfaces above the water line, including trim, railings and wood furniture
• Oil-based formula expands and contracts with changing weather conditions
• Dries to the touch in 2 hours and covers up to 150 sq. ft.
• Durable coating provides excellent resistance to UV, salt and mildew
• Crystal-clear varnish leaves a beautiful gloss finish with maximum protection
• UV resistant
• Salt and mildew resistant
• Expands and contracts with changing weather conditions
• Twice as durable as conventional wood finishes
• This item is not for sale in Catalina Island

Rust-Oleum

• High quality product
• High durable product
• Manufactured in United States

OLYMPIC/PPG ARCHITECTURAL FIN

• Contains UV blockers to reduce the sun's graying and fading effects
• Forms a protective barrier against rain and moisture
• Special oils allow the finish to expand and contract with the wood as seasons and temperatures change
• Ideal for use on doors, windows, trim, bathroom cabinets, bar tops, kitchen countertops, outdoor furniture
• Crystal clear finish is ideal for use over light-colored woods and stains. Dries quickly and cleans up easily with warm water
• Spar urethane
• Specially formulated protective clear finish for exterior or interior wood that is exposed to sunlight, water or temperature changes
• Contain UV blockers to reduce the sun's graying and fading effects
• Forms a protective barrier against rain and moisture
• Special oils allow the finish to expand and contract with the wood as seasons and temperature changes
• Spar urethane
• Specially formulated protective clear finish for exterior or interior wood that is exposed to sunlight, water or temperature changes
• Contain UV blockers to reduce the sun's graying and fading effects
• Forms a protective barrier against rain and moisture
• Special oils allow the finish to expand and contract with the wood as seasons and temperature changes

Minwax

• Prevents surface damage from rain, snow, ice with a satisfaction guarantee for up to five years
• Does not alter surface appearance, does not leave a surface film and helps prevent efflorescence
• Contains advanced UV stabilizers to ensure long lasting non-yellowing performance
• Concentrate formula - easily mixed, save money and great for the environment
• Apply a flood coat with a sprayer, brush or roller, no maintenance required and safe for People, Pets and Plants

Rain Guard

• Prevents further drying and fading of wood finishes due to sun exposure, temperature variations, and moisture both indoors and outdoors
• Enhances the natural beauty and depth of grain as it protects your wood furniture
• Unique formula combines UV inhibitors with a blend of carnauba wax, beeswax, and orange oil
• Conditions and protects any wood surface, especially teak and other tropical hardwoods
• Replenishes finished or unfinished dry wood surfaces on chairs, tables, benches, chests, desks, lounge chairs, etc.

Howard Products

• Item Weight: 9.65 lb
• Country of Origin: China
• Brand name: Thompson's Water Seal
• Item Dimensions: 4.1"L x 6.6"W x 11.0"H

Thompson's Water Seal