Shield concrete, masonry, and wood surfaces from moisture with durable waterproofing paints and sealants designed for exterior use. This guide highlights five leading products that mix protection with easy application, suitable for basements, foundations, decks, and wood surfaces. Each pick is evaluated for adhesion, flexibility, and long-term performance to help homeowners choose the right solution for their specific project.
| Product | Brand | Best For | Surface Type |
|---|---|---|---|
| KILZ Basement and Masonry Waterproofing Paint | KILZ | Basements, masonry walls | Concrete, masonry |
| Liquid Rubber Basement and Foundation Repair Sealant | Liquid Rubber | Active leaks, foundations | Concrete, masonry |
| Zinsser WaterTite-LX | Zinsser | Mold and mildew-prone areas | Dry walls, masonry |
| Zinsser WaterTite Professional | Zinsser | Interior/exterior masonry | Concrete, stucco, cement |
| Olympic WaterGuard Exterior Wood Sealer | OLYMPIC | New and weathered wood | Wood |
KILZ Basement and Masonry Waterproofing Paint
This premium interior/exterior paint is designed to waterproof and seal porous concrete and masonry walls both inside and outside the home. It uses nanotechnology to form a barrier against water infiltration, with an alkali-resistant coating for a durable, decorative finish. It’s suitable for properly prepped above and below grade basement walls, masonry surfaces, and many other substrates, including stucco and brick. Do not apply on floors or walls with active leaks. Recommended application tools include a high-quality 1/2–3/4 inch nap roller, 4 inch brush, or an airless sprayer capable of 2200–3200 PSI with a .023″–.025″ spray tip. This product emphasizes long-term protection with a focus on porous materials prone to water infiltration.
Olympic WaterGuard Exterior Wood Sealer Spray
Ready-to-use clear sealant and waterproofer designed for new wood, pressure-treated wood, weathered wood, and wood with weathered finishes. This exterior wood sealer provides waterproofing protection while preserving the natural look of the wood. It’s suitable for various wood substrates and can be applied to protect against moisture intrusion on decks, siding, and other exterior wooden surfaces. The product emphasizes ease of use and transparency for a natural wood appearance while delivering durable moisture resistance.
Liquid Rubber Basement and Foundation Repair Sealant
This flexible, professional-grade sealant creates a permanent waterproof membrane for basement waterproofing, foundation leak repair, and shower liners. With 900% elongation, it addresses movement and cracking, forming a robust barrier that resists moisture at the source. It works as a complete basement waterproofing system beyond traditional paints, and is compatible with self-leveling concrete applications. It adheres well to concrete, masonry, wood, metal, and foundation surfaces, making it versatile for DIY projects and major repairs alike. The emphasis is on long-term protection against active leaks and moisture migration.
KILZ Waterproofing Wood Stain, Exterior
KILZ Waterproofing Wood Stain provides exterior protection with a stain-ready finish. The product line emphasizes durable, weather-resistant color and protection against moisture while enhancing wood aesthetics. It combines stain and sealant properties, supporting long-lasting color and surface defense for decks, siding, and trim. The description highlights low VOC considerations and coverage that helps preserve the wood’s natural beauty while resisting water intrusion.
Zinsser WaterTite-LX Mold & Mildew-Proof Waterproofing Paint
Latex-based waterproofing paint designed to stop water intrusion while resisting mold and mildew growth. It offers a smooth, bright white finish that applies easily to dry walls with brush or roller. It is positioned for interior spaces and select exterior surfaces where a water-resistance layer is necessary, with emphasis on mildew resistance and ease of application for a clean, uniform finish. The product targets spaces prone to moisture, providing a protective coating that helps curb water penetration and upkeep concerns.
Zinsser WaterTite Professional Waterproofing Paint
Designed for interior and exterior masonry surfaces, including concrete, stucco, and cinder blocks. It carries a lifetime waterproof guarantee and can cover up to around 225 square feet per gallon, depending on porosity and application technique. The product focuses on robust moisture protection with a guaranteed waterproof result, suitable for areas with high exposure to water pressure and dampness. It’s positioned as a reliable solution for long-term masonry protection on both above- and below-grade surfaces.
Buying Guide
Key purchase considerations
- Surface type and exposure: Choose products formulated for concrete, masonry, or wood, and consider if the area is above or below grade, indoors or outdoors.
- Moisture conditions: For active leaks or high moisture, look for sealants or long-term membranes (e.g., liquid rubber or high-elasticity coatings) rather than standard paints.
- Flexibility and elongation: Materials that expand and contract with temperature changes prevent future cracking and maintain waterproof integrity.
- Opacity and finish: White or tinted finishes alter appearance; consider the final look, whether you want a clear protective layer or a color-maintaining coating.
- Application method: Some products are spray-ready, while others are best with rollers or brushes. Verify tip size and equipment compatibility for best results.
- Durability and maintenance: Long-term warranties or proven performance in damp environments can guide choices for basements or foundations.
Choosing among the options
- Best for porous masonry: KILZ Basement and Masonry Waterproofing Paint offers nanotech barrier protection with alkali resistance, suited for walls that need both sealing and a decorative finish.
- Best for active leaks and foundations: Liquid Rubber Basement and Foundation Repair Sealant provides a flexible membrane that remains durable with movement, a strong choice for leak-prone areas.
- Best for mold-prone interiors: Zinsser WaterTite-LX focuses on mold and mildew resistance while delivering a smooth white finish for interior walls.
- Best for professional strength masonry: Zinsser WaterTite Professional targets interior/exterior masonry with a robust guarantee and broad coverage per gallon, ideal for larger projects.
- Best for wood surfaces: Olympic WaterGuard preserves the natural look of wood while providing moisture protection for decks and exterior wood elements.
Installation tips
- Prepare the surface by cleaning and repairing cracks or defects prior to application.
- Follow manufacturer recommendations for temperature, humidity, and curing times to ensure optimal adhesion.
- Prime or seal porous substrates if required by the product to improve coverage and durability.
- Use appropriate tools and safety gear, especially when applying coatings outdoors or on elevated surfaces.
- Inspect the coated areas after curing for any missed spots or thin patches and reapply as needed for uniform protection.