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Multi-Surface Concentrate with NANO

Penetrating Sealer for Wood, Concrete & Masonry

5.00 out of 5based on 2 customer ratings
2 customer reviews


  • Decks & Fences
  • Shingles & Siding
  • Log Homes
  • Planters & Railings
  • Beams & Furniture
  • Play Structures
  • Poured Concrete
  • Stamped Concrete
  • Pavers & Bricks
  • Stucco & Slate


  • Water-based, Ultra-Low VOC
  • Eco-friendly, Non-toxic, No Odor
  • Won't harm people, pets or plants
  • Penetrates below the surface
  • Creates flexible, breathable barrier
  • Prevents mold, mildew & wood rot
  • Stabilizes from cracking & spalling
  • UV barrier protects from sun rays
  • Clear can be painted or stained
  • Easy soap & water clean-up

SEAL-ONCE® has been leading the innovation in the use of nanotechnology to create long-lasting, eco-friendly wood sealers & tinted wood stains since 2005.  Multi-Surface Concentrate with NANO deeply penetrates the surface to protect & stabilize wood, concrete & masonry against adverse weather & caustic conditions, including salt water spray.  It uses proprietary nano-polymers to form a flexible, breathable barrier by coating the wood fibers and concrete pores, preventing water ingress.

Multi-Surface Concentrate Waterproofing Sealer & Stain preserves the integrity of wood, concrete and masonry by inhibiting cracking, spalling, warping, cupping, rot, decay, mold, mildew & algae growth. It forms a pliable, breathable barrier that allows the substrate to expand & contract & water vapor to escape. It is non-film forming, non-yellowing and will not alter the natural color of wood, concrete or masonry.

Multi-Surface Concentrate is diluted 1:1 with clean water to create the final, usable formula.  It goes on milky white &  dries clear.  It allows wood to silver naturally over time, and can also be mixed with any of our 11 semi-transparent color tints for wood, to enhance the appearance of your project.  Warranted to prevent long-standing water accumulation for up to 10 years on horizontal & 6 years on vertical surfaces.

Product Details

  • All surfaces should be cleaned before sealing for best penetration and performance.
  • Remove all old coatings, dust, debris and loose material. Remove oil, grease, algae, grime, mill glaze and mold and mildew stains with appropriate cleaners. Recommend SEAL-ONCE All Wood Cleaner or SEAL-ONCE Concrete/Masonry Cleaner.
  • Test absorbency after cleaning by sprinkling water on surface. If the water does not readily penetrate the surface, stripping will be necessary to remove old coatings before applying SEAL-ONCE Multi-Surface Concentrate.
  • Do not use if air or surface temperature is below 45°F/7.22°C or above 95°F/35°C.
  • Do not apply in rain or when rain is expected within 12-24 hours.
  • DO NOT THIN. Mix well. Stir contents or shake thoroughly prior to use.
  • Test a small area to ensure acceptable appearance and penetration.
  • Apply first coat with a synthetic brush; pump-up garden sprayer; air-assisted; and/or airless sprayer. Use 15-17 tip and medium to coarse spray pattern. When spraying, always back brush for best results.
  • Second coat can be applied once first coat has penetrated but is still damp. Second coat must be applied within one hour of applying first coat.
  • For best results, apply in the shade and out of direct sunlight.
  • When applying in direct sunlight and wood surface is hot, spray with a mist of water and apply Multi-Surface Concentrate immediately on dampened surface.
  • Apply to all surfaces. Apply SEAL ENDS ONCE® to wood ends.
  • Do not use with other waterproofing products.
  • Substrate can be painted or stained as soon as it dries in approximately 2-3 hours.
  • Allow approximately 2-3 hours for surface to dry, depending on temperature and humidity.
  • Allow 12-24 hours for full cure, depending on temperature and humidity.
  • When recoating, apply as soon as previous coat has penetrated and surface is damp, not wet. Second coat must be applied within one hour of applying the first coat.
  • Clean all application equipment with warm soapy water.
  • Disposal: soap and water cleanup; no special disposal procedure needed.
  • Store above 32°F/0°C to protect from freezing.
  • Shelf life (unopened): 3 years
Surfaces that have been treated with Multi-Surface Concentrate can be cleaned using a mixture of 1-gallon warm water, 14 oz. bleach, and 1 oz. of Dawn® dish detergent. Apply this cleaning solution with a sprayer and allow to sit for 20 to 30 minutes on the wood surface before rinsing with water using a garden hose with a nozzle. This cleaning solution can be used to remove airborne mold and mildew stains, dirt and grime from the wood surface. Multi-Surface Concentrate will prevent and resist any water, mold and mildew penetration. Do not use oxidizers, corrosives, or strippers on surfaces that have been treated with Multi-Surface Concentrate. Surfaces can be recoated with Multi-Surface Concentrate at any time. Multi-Surface Concentrate may need to be reapplied for fading tint color, surface damage, in heavily worn or high traffic areas, or in places where the surface may have undergone noticeable changes. Before reapplying Multi-Surface Concentrate, clean the surface using the recommended cleaning solution above. Apply Multi-Surface Concentrate according to package instructions. When reapplying in small areas, lightly overlap onto areas previously treated with Multi-Surface Concentrate.

$5 Off Your 1st Order.

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