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4.5 out of 5 stars. 48 reviews
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Seal-Once 1 gal. Clear Water-Based Waterproofing Exterior Sealer, Eco-Friendly Barrier, Low VOC

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Seal-Once 1 gal. Clear Water-Based Waterproofing Exterior Sealer, Eco-Friendly Barrier, Low VOC

Item # 2494331

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The Seal-Once 1 gal. Clear Water-Based Waterproofing Exterior Sealer provides protection and stability for wood that finishes and performs, as well as an oil base, and withstands harsh environments near open water. Water based, eco-friendly and ultra-low VOC ensures the product is safer for people, pets and plants and is non-hazardous to aquatic life. Formulated to penetrate below the surface, creating a flexible and breathable barrier that expands and contracts with the elements, resists abrasion, plus protects against UV fading and water damage. For use on docks, decks, fences and siding. Use this waterproofing sealer to seal and protect up to 10 years on vertical surfaces and 6 years on horizontal surfaces.

  • Penetrates below the surface
  • Water-based, eco-friendly and ultra-low VOC waterproofing sealer
  • Resists abrasion for durability
  • Repeals moisture within 4 hours
  • Creates a flexible and breathable barrier
  • Protects against UV fading and water damage
  • Withstands harsh environments near open water
  • Non-hazardous to aquatic life
  • Seals and protects up to 10 years on vertical surfaces and 6 years on horizontal surfaces
  • Covers up to 90 sq ft.

Q&As

1 - 10 of 18 Questions

Q: Can I use this on plywood sub top for an exterior stone counter?

26 days ago
1 Answer
  • A: Plywood is notorious for absorbing moisture. Seal-Once will slow it down but not stop it. New pressure treated wood will need to weather 3 months in warm weather before you clean and apply Seal-Once. (Moisture content must be under 20%) FYI: Seal-Once is not appropriate and not tough enough for use on a boat, shop floors, trailer floors, sub floors, sub countertops, or roofing construction. You cannot apply stain, sealers, primer, paint, glue, epoxy, polyurethane, or varnish over Seal-Once. They will bead up and roll off. Also, you cannot apply Seal-Once products over stain, sealers, primer, paint, glue, epoxy, polyurethane, or varnish. Seal-Once will not penetrate leaving un-even shiny/sticky spots. We do not make any products for your project. You need an industrial sealer. We do not make that type of product.
    25 days ago
    Helpful?

Q: Can it be applied over stain and sanded spar varnish that has been stripped

a month ago
1 Answer
  • A: Do not apply Seal-Once over stain or varnish. There may be old product hidden deep in the wood pores and Seal-Once will not penetrate leaving un-even shiny sticky spots. You cannot apply Seal-Once products over stain, sealers, primer, paint, polyurethane, or varnish. Seal-Once will not penetrate leaving un-even shiny/sticky spots. Also, you cannot apply stain, sealers, primer, paint, polyurethane, or varnish over Seal-Once. They will bead up and roll off.
    a month ago
    Helpful?

Q: What is the best way to apply this product to the wood?

a month ago
1 Answer
  • AI-assisted
    A: Hi Neighbor- The best way to apply this sealer is using a brush to push the product into the wood. If you spray or roll it on, you must immediately back-brush the area. Apply two thin coats "wet on wet," meaning the second coat should be applied within 20 minutes while the first is still wet.
    a month ago
    Helpful?

Q: Is this Acrylic Resin

2 months ago
1 Answer
  • A: Hi Neighbor! Seal-Once Clear Water-Based Waterproofing Exterior Sealer is an eco-friendly product specifically designed for exterior wood surfaces. It is a low VOC formulation that creates a flexible, breathable barrier against moisture, allowing wood to expand and contract without peeling.
    2 months ago
    Helpful?

Q: Can this be used on honey bee hive boxes?

3 months ago
1 Answer
  • A: Do not apply Seal-Once to a bee hive box. We do not recommend any Seal-Once product for animal or insect cages or enclosures. Also, we do not have FDA approval for use around food/honey.
    3 months ago
    Helpful?

Q: how long does it take to dry

4 months ago
2 Answers
  • A: Allow 2-3 hours, depending on temperature and humidity, for surface to dry. Allow 24 hours for full cure. Seal-Once is for exterior wood surfaces. We do not make any interior products.
    4 months ago
    Helpful?

Q: drying time or how long before a second coat can be applied

4 months ago
2 Answers
  • A: The second coat must be applied while the first coat is still wet. You can apply the required 2 coats of Seal-Once exterior water proofer with a brush. Apply 2 thin coats. If you spray or roll, you must immediately brush the area using a brush. It is called back brushing. Do not spray or roll and leave it, you must back brush it immediately after spraying or rolling, using a brush. Brushing is very important. You begin at the end of two boards. You will brush to the other end of the same two boards. Now apply a second coat to the same 2 boards. Apply the second coat within 5-10 minutes of the first coat. The second coat must be applied while the first coat is still wet. (Wet on wet application). Push the product into the wood with the brush. Spread it out evenly and not too heavy. More is not always better. Do not allow it to puddle. Wipe off any excess with a rag. This way, you never walk over wet product. Three things to avoid during application: 1. Waiting too long between the first and second coat. 2. Do not apply too heavy. (Apply thin coats). 3. When applying the second coat, if you can't brush the product into the wood because there is too much, don't leave it on the surface thinking it will magically soak into the wood. The wood is already saturated. Wipe the excess off with a rag. If you don't wipe off the excess, it will leave un-even shiny sticky spots that will attract dirt and mildew. Wait till Spring to complete your project. Seal-Once will work OK in 50 degree weather, ( must be 50 for 24 hours), but your wood will get damp from dew and rain. At lower temps during the night, water in the wood takes many days and weeks to dry out. If you use Seal-Once on wood that looks dry but is actually damp inside the wood cells, Seal-Once will not penetrate leaving un-even shiny/sticky spots. Also the "Multi-Surface Cleaner" you must use, works much better when the temps are in the 70's and above. If you wait till Spring, your wood will get a bit more silvery grey over the Winter months, but you will restore the color using Seal-Once "Multi-Surface Cleaner" in the Spring.
    4 months ago
    Helpful?

Q: Can this be used on cedar?

7 months ago
1 Answer
  • A: Hi Neighbor! Yes, this product can be used on Cedar.
    7 months ago
    Helpful?

Q: Can I spray it on wood

8 months ago
1 Answer
  • A: Hi Neighbor- For use on docks, decks, fences and siding.
    8 months ago
    Helpful?

Q: Is this safe for chicken coop?

8 months ago
1 Answer
  • A: Do not use Seal-Once products on your chicken coop. We do not recommend Seal-Once for animal cages or animal enclosures. We do not have FDA approval for use around food. As you know, chickens peck at everything.
    8 months ago
    Helpful?
1 - 10 of 18 Questions

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Reviews

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37 reviews with 5 stars.
6 reviews with 4 stars.
1 review with 3 stars.
1 review with 2 stars.
3 reviews with 1 star.

Overall Rating

4.5
6 out of 7 (86%) reviewers recommend this product

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1 to 4 of 48 Reviews .
1 – 4 of 48 Reviews
Review 1

Waterproof sealer

12 days ago
This sealer is one ☝️ of the best that I have used.
SweepstakesYes
Response from uccoatings Team:
8 days ago
uccoatings Team
Thank you for your feedback, we’re happy to hear that this product worked well for your application! uccoatings
Review 1

Great product for any type of wood

12 days ago
I used this on outdoor wood and was impressed with how easy it was to apply. It soaked into the wood nicely without leaving a thick film and helped bring out the natural color. The finish looks clean and protected, and I'm excited to see how it holds up over time

Originally posted on influenster.com

Chetek, Wi
Review 1

Good product

15 days ago
Clean, clear and easy to mix and apply
SweepstakesYes

Yes, I recommend this product.

Response from uccoatings Team:
15 days ago
uccoatings Team
Thank you for your feedback, we’re happy to hear that this product worked well for your application! uccoatings
colorado
Review 1

Made the wood floor of my trailer look great!

23 days ago
I put two coats on and it looks great plus water beads up nicely. I think it will protect for several years.
SweepstakesYes

Yes, I recommend this product.

Response from uccoatings Team:
21 days ago
uccoatings Team
Thank you for your feedback, we’re happy to hear that this product worked well for your application! uccoatings