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4.4 out of 5 stars. 59 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 23 Questions

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

14 days 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.
    6 days ago
    Helpful?

Q: Is the finish glossy?

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

Q: Is it a satin or shiny finish

30 days ago
1 Answer
  • A: Hi Prayer shed! This has a flat/satin-like finish.
    29 days 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

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

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

2 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.
    2 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?

Q: Is this Acrylic Resin

3 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.
    3 months ago
    Helpful?

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

5 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.
    5 months ago
    Helpful?
1 - 10 of 23 Questions

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Reviews

Rating Snapshot

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45 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

4.4
8 out of 12 (67%) 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 59 Reviews .
1 – 4 of 59 Reviews
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

Review 1
Age55 to 64
GenderFemale

remained sticky

a month ago
This product was sticky after the dry time and it was applied correctly but still remained sticky,

No, I do not recommend this product.

Originally posted on UC Coatings

Review 1

Goes on clear.

a month ago
Goes on clear. We will see how it works after time
SweepstakesYes

Yes, I recommend this product.

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