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4.5 out of 5 stars. 62 reviews
A woman outside with a dog
A woman outside with a dog

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

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

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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 25 Questions

Q: Is this the marine grade? Item # 2494331

2 days ago
1 Answer
  • A: Yes, Item # 2494331 is Seal-Once Marine Grade. What is your project so I may send you information on preparation, application, and expectations? Contact us directly for more detailed info.
    21 hours ago
    Helpful?

Q: Methods of application

10 days ago
1 Answer
  • A: You did not if it was a deck, dock, siding, or fence. We will assume it is for a deck: you can apply the required 2 coats of Seal-Once 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.
    7 days ago
    Helpful?

Q: Would it be safe for chicken coop exterior? To seal outside of the coop?

a month ago
2 Answers
  • A: We do not recommend any Seal-Once products for animal cages or animal enclosures, including the outside surface of the coop.
    26 days ago
    Helpful?

Q: Is the finish glossy?

a month ago
1 Answer
  • A: It's a semi-gloss finish.
    a month ago
    Helpful?

Q: Is it a satin or shiny finish

a month ago
1 Answer
  • A: Hi Prayer shed! This has a flat/satin-like finish.
    a month ago
    Helpful?

Q: can it be used over Trex

a month ago
1 Answer
  • A: Hi Dave- No. You cannot apply another stain, sealer, or paint over a previously applied layer of SEAL-ONCE Clear Exterior Sealer.
    a month ago
    Helpful?

Q: 7+12 utility trailer wood deck how many gallons to do

2 months ago
1 Answer
  • A: Hi Dawg69! Coverage Area is 350 SQ FT so you will need roughly 2 gallons of Seal-Once sealer.
    2 months ago
    Helpful?

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

3 months 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.
    3 months ago
    Helpful?

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

3 months 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.
    3 months ago
    Helpful?

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

3 months ago
1 Answer
  • AI-assisted, Human-approved
    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.
    3 months ago
    Helpful?
1 - 10 of 25 Questions

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Reviews

Rating Snapshot

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

Overall Rating

4.5
10 out of 14 (71%) reviewers recommend this product

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Summary of Reviews

AI-generated from customer ratings & reviews, and may include incentivized reviews.
Customers overwhelmingly praise this wood sealer for its ease of application, clear finish, and natural appearance. Most highlight the milky-white application that turns clear upon drying, making coverage gaps visible and final results professional-looking without altering wood color. Many report st...
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1 to 4 of 62 Reviews .
1 – 4 of 62 Reviews
North Carolina
Review 1

Sealer works great

2 days ago
Seal-Once Marine grade Sealer

Yes, I recommend this product.

Del Rio TX
Review 1

Great Wood seal

8 days ago
This went on well and we'll see in a year or two how well it works. Make sure you read the application directions!
SweepstakesYes

Yes, I recommend this product.

Response from uccoatings Team:
7 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

Nice Sealer

a month ago
Thís looks great on finished projects we do around the house and seems to do well with protecting it. Sealer goes on smooth and soaks in very well. Great stuff.

Originally posted on UC Coatings

WV
Review 1
Age65 or over
GenderFemale

Dazed and Amazed

a month ago
Beautiful finish without the shining glare I see with most wood treatments and is barely, and I mean barely, changed the way the boards appeared. EASY to use!! I highly recommend this product if you want your raw wood sealed without changing the natural appearance. I am so impressed.

Yes, I recommend this product.

Originally posted on UC Coatings