Common Questions

SEAL-ONCE products can be used on wood, concrete or masonry. This includes pressure-treated wood, exotic wood, wood siding, log homes, cedar shakes and wood decking. Our products can also be applied to stucco, clay tiles, paver blocks, bricks, poured and stamped concrete, grout and mortar.

SEAL-ONCE® NANO GUARDTM is a non-film forming, deep-penetrating, nano-polymer formula that creates a flexible breathable barrier to protect wood and concrete/masonry against damage caused by water-ingress. SEAL-ONCE NANO GUARD PLUS POLY combines our proprietary nano-polymer formula with the strength of polyurethane to provide 360° of protection for wood and concrete. SEAL-ONCE ACRYLIC POLY forms a flexible barrier that shields wood, concrete and masonry from water damage, abrasion and harmful UV rays.

To thaw our your can of SEAL-ONCE®, Bring the can indoors and store it at room temperature until it thaws completely. Do not try to heat it up or place it in front of a heater as this may alter the effectiveness of the product.

To obtain the maximum life out of your SEAL-ONCE® product, it should be stored much like paint in a tightly sealed container at room temperature, out of direct sunlight. Stored properly, SEAL-ONCE® NANO GUARDTM has a shelf life of 3 years. SEAL-ONCE NANO GUARD PLUS POLY, when stored properly, has a shelf life of 18-24 months. SEAL-ONCE ACRYLIC POLY, when stored properly, has a shelf life of 18 months.

All SEAL-ONCE products are fully cured in 24 hours.

We recommend allowing 12 hours for SEAL-ONCE® NANO GUARDTM to dry completely prior to rain. NANO GUARD PLUS POLY and ACRYLIC POLY need to fully cure for 24 hours prior to rain.

SEAL-ONCE® NANO GUARDTM deeply penetrates the wood or concrete surface by utilizing eco-friendly nano-polymers to form a flexible breathable barrier that prevents damage caused by water ingress. Its nano-polymers are not visible to the naked eye and are approximately one-millionth the length of a millimeter. As a result, these particles are able to deeply penetrate the surface, providing superior protection from the inside-out.

Clear SEAL-ONCE® NANO GUARDTM is UV-stable, which means it will not degrade or turn yellow from UV radiation, however, it does not provide UV protection. All wood surfaces applied with NANO GUARD will age naturally, turning a rich silver color, unless one of our Semi-Transparent Tints are added. SEAL-ONCE NANO GUARD PLUS POLY provides protection from UV rays, which is enhanced when one of our Semi-Transparent Tints are added. SEAL-ONCE ACRYLIC POLY provides the highest level of protection against UV fading.

All SEAL-ONCE® products are compatible with our proprietary Semi-Transparent Tints. These tints and stains are sold separately and should be mixed at a 1:1 ratio; one tint bottle per one gallon of SEAL-ONCE.

Yes, our products are freeze-thaw stable, though measures should be taken to keep the product from freezing. All SEAL-ONCE® products can go through up to three (3) freeze-thaw cycles and still be used. If the product freezes, bring it inside to thaw completely at room temperature. Do NOT place in front of a heat source or heat the container. Once the product has thawed completely, stir, shake or mix thoroughly before using. 

Yes, our products work well for both interior and exterior projects.

Yes, all SEAL-ONCE products are water-based and do not contain any harmful chemicals or toxins. SEAL-ONCE NANO GUARD contains zero VOCs. SEAL-ONCE NANO GUARD PLUS POLY and ACRYLIC POLY are low VOC formulas. Our products can be safely applied around open water, pets, children, fish, landscaping and vegetation. Additionally, our products do not require special personal protective equipment (PPE) or disposal methods and can be cleaned up using soap and water.

Product Application Questions

Ensure all surfaces have been properly cleaned by using the appropriate SEAL-ONCE® cleaner (All Wood Cleaner, Concrete/Masonry Cleaner or ReNew Concrete). Apply the cleaners according to the package instructions. After cleaning, rinse the surface with water and allow to dry completely. If the surface has been coated or sealed previously with another product, that product must be removed prior to applying any SEAL-ONCE products. The old coating can be removed by stripping, sanding or power washing the surface. Once the surface has been cleaned and the old coating has been removed, SEAL-ONCE NANO GUARDTM, NANO GUARD PLUS POLY or ACRYLIC POLY can be applied according to package instructions.

Yes, we recommend covering all surrounding materials and surfaces, as well as wiping down all areas impacted by over spray while still wet. While all SEAL-ONCE® products are eco-friendly and will not harm the surrounding landscaping, it is advised that you cover any adjacent walls or materials that are not recommended for coating with SEAL-ONCE, especially if you are using one of our semi-transparent tints.

No, you do not need special equipment. SEAL-ONCE® NANO GUARDTM and NANO GUARD PLUS POLY can be applied using a brush or stain pad. For faster application, a pump sprayer with a 17-19 tip can be used.  Paint rollers are only recommended for applying SEAL-ONCE ACRYLIC POLY. Do not use paint rollers to apply SEAL-ONCE NANO GUARD or NANO GUARD PLUS POLY. Additional application information is listed on our technical data sheets, which can be found on our Data Sheets & Guides page.

SEAL-ONCE® NANO GUARDTM should be applied at temperatures between 45°F (7.22°C) and 95°F (35°C). SEAL-ONCE NANO GUARD PLUS POLY and ACRYLIC POLY should be applied between 50°F (10°C) to 95°F (35°C). These temperature ranges apply to both surface and air temperature.

Product Application Questions > SEAL-ONCE ACRYLIC POLY

SEAL-ONE® ACRYLIC POLY must be applied in thin, light coats to ensure even application and protection against water ingress. Please refer to the Data Sheets & Guides page of our website for complete application information.

No, it is not necessary to sand the surface between coats of SEAL-ONCE® ACRYLIC POLY, if the proper application procedures have been followed. If the first coat has been allowed to cure for more than 24 hours, lightly sand the surface with 220 grit sandpaper. Remove all dust after sanding to ensure a clean, debris-free surface prior to applying the second coat of SEAL-ONCE ACRYLIC POLY.

Product Application Questions > SEAL-ONCE NANO GUARD

No, tinted SEAL-ONCE NANO GUARD will not leave streaks when applied properly. When following our instructions for applying two (2) coats “wet on damp,” the second coat will blend evenly into the first.

The first coat should have begun to dry and be damp to the touch prior to applying the second coat of SEAL-ONCE® NANO GUARDTM. It is recommended that the second coat be applied while the first coat is drying for maximum effectiveness.

The proper application procedures can be found within the technical data sheet for each of our products. For a full list of technical data sheets and application guides, please refer to our Data Sheets & Guides page.

Yes, SEAL-ONCE NANO GUARD is safe for application around open water, such as a pond, lake stream river or ocean. It is eco-friendly, non-toxic and contains zero VOCs. A full toxicity report can be found here.

No, it is recommended that two coats of SEAL-ONCE® NANO GUARDTM be applied to the wood or concrete surface to ensure a sufficient coating to protect against damage caused by water penetration.

Product Application Questions > SEAL-ONCE NANO GUARD PLUS POLY

Allow two to three hours for the first coat of SEAL-ONCE® NANO GUARDTM PLUS POLY to dry completely before applying the second coat.

Please refer to Technical Data Sheet for NANO GUARDTM PLUS POLY on the Data Sheets & Guides page of our website for complete application information.

Seal-Once Semi-Transparent Tints

All of our tints are semi-transparent, allowing the color and grain of the wood to show through. The color charts on our website have been created using two coats of our tinted SEAL-ONCE NANO GUARD and NANO GUARD PLUS POLY on red cedar. If you are coating a different material, you will see different results since the semi-transparent nature of our tints allow some of the natural characteristics of the wood to show through. Using more than two coats will also result in a darker, more saturated appearance than what is on our website.

We offer 4oz pre-mixed bottles of all of our semi-transparent tints for testing on the material you are coating. Samples can be purchased in our webstore.

Pour the entire contents of the tint bottle into the gallon can of SEAL-ONCE® NANO GUARDTM or NANO GUARD PLUS POLY (1:1 ratio) and stir with a paint stick until fully blended. To remove any remaining residue from the tint bottle, partially fill the bottle with the NANO GUARD or NANO GUARD PLUS POLY and shake to mix the contents. This mix should be poured back into the gallon can and mixed in thoroughly.

No, only the SEAL-ONCE® semi-transparent tints have been specially formulated for our products. Other colors or pigments may alter the effectiveness of our products.

Substrate-Specific Questions > Concrete

Yes, SEAL-ONCE® NANO GUARDTM, NANO GUARD PLUS POLY and ACRYLIC POLY all prevent efflorescence, which occurs when water penetrates the concrete and leaches out naturally-occurring salts, creating undesirable white stains on the concrete. Efflorescence must be removed prior to applying SEAL-ONCE products. We recommend using our Re-New Concrete cleaner.

Yes, SEAL-ONCE® NANO GUARDTM can be applied to green concrete once the concrete has completely hardened and all of the water has evaporated. We do not recommend applying SEAL-ONCE NANO GUARD PLUS POLY or ACRYLIC POLY to green concrete, however both products can be applied once the concrete has fully cured.

Substrate-Specific Questions > Wood

Pressure treated wood is created using chemicals and other materials that need to properly cure prior to applying a waterproofing sealer or coating. If a sealer or coating is applied to pressure treated wood before it has cured, it can result in peeling, cracking, bubbling and other adhesion problems. In the case of SEAL-ONCE® NANO GUARDTM, if the product is applied too soon, the chemicals in the wood can prevent penetration, which will inhibit our product’s ability to protect the wood from water damage. The best way to determine if pressure treated wood has cured, and is ready for SEAL-ONCE products to be applied, is to pour water on the surface to see if it soaks in or pools. If the water soaks in, the wood has cured and is ready for SEAL-ONCE NANO GUARD, NANO GUARD PLUS POLY or ACRYLIC POLY to be applied.

SEAL-ONCE® NANO GUARDTM and NANO GUARD PLUS POLY can be applied to freshly cut wood because they create a breathable barrier, allowing water vapor to escape as the wood ages. We do not recommend using SEAL-ONCE ACRYLIC POLY on freshly cut wood as it creates a surface coating and is not breathable.

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