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SEAL ENDS ONCE® Premium End Sealer deeply penetrates the ends of lumber to protect against water damage and decay. The water based formula uses a proprietary nanotechnology to form a flexible, breathable barrier by coating the wood fibers at the cellular level.

SEAL ENDS ONCE protects the cut ends of lumber by preventing water absorption. It can be used to preserve old or new wood, extending its natural life. It is non-film forming, non-yellowing and will not alter the natural beauty of the wood.

SEAL ENDS ONCE should be used alongside other SEAL-ONCE Wood Sealers.

Recommended Use:
Cut ends of all soft and hardwoods including:
Cedar Ipe Mahogany Cumaru Bamboo Timbersil Redwood Tigerwood Fir Pressure treated lumber




Product Details

  • Eco-friendly
  • Ultra-low VOC (25g/L)
  • Non-toxic; will not harm pets, plants or people
  • Non-film forming, flexible breathable barrier
  • Eliminates warping & cupping
  • Prevents wood rot & decay
  • Prevents mold, mildew & fungi growth
  • Stabilizes & protects wood
  • Soap & water clean-up


  • 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.
  • 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.
  • 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 imminent.
  • 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 to end cuts using a synthetic brush or stain pad.
  • 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 SEAL ENDS ONCE immediately on dampened surface.
  • Do not use with other waterproofing products.
  • Wood 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 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 SEAL ENDS ONCE 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. SEAL ENDS ONCE will prevent and resist any water, mold and mildew penetration. Do not use oxidizers, corrosives, or strippers on surfaces that have been treated with SEAL ENDS ONCE.

Surfaces can be recoated with SEAL ENDS ONCE at any time. SEAL ENDS ONCE may need to be reapplied in places where the surface may have undergone noticeable changes.

Before reapplying SEAL ENDS ONCE, clean the surface using the recommended cleaning solution above. Apply SEAL ENDS ONCE according to package instructions. When reapplying in small areas, lightly overlap onto areas previously treated with SEAL ENDS ONCE.

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