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NANO+POLY Premium Wood Sealer

(7 customer reviews)

$25.98 USD$284.98 USD

  • Combines penetrating nanotechnology to protect below the surface with polyurethane for enhanced 360° protection in high traffic areas
  • Flexible, breathable barrier allows wood to expand & contract safely
  • Water based, ultra-low VOC, Non-toxic with UV blockers to prevent fading
  • Prevents warping & cupping and stains caused by mold, mildew & algae
  •  Approximate coverage: 250-350 sq. ft./gallon per coat. Based on surface porosity.

Additional information


1-Quart, 1-Gallon, 5-Gallon


Battleship Gray, Black, Bronze Cedar, Brown, Cape Cod Gray, Cedar, Clear, Light Brown, Mahogany, Natural, Redwood, Shale Gray

7 reviews for NANO+POLY Premium Wood Sealer

  1. Charlene

    My husband has always used smelly, oil based sealers on our fence and old deck. After we installed a new deck in 2018 , we loved the idea of a safer, water-based sealer like Seal Once. Not only does the deck look great after using Seal Once, we love that it is not full of toxic chemicals, since our family and dogs spend a ton of time on the deck.

  2. Larry

    I did a lot of research prior to choosing Seal Once for our deck. I was initially leaning toward an oil-based product they sell at home depot, but went with the NANO+POLY after doing more research on-line. Though water-based, it penetrates well and has easy cleanup. Knowing you can get a water-based product that works as well as an oil, makes it an easy choice for us, even when the cost is a bit higher. It was very thin and watery when I opened the can, which worried me a little at first, but the bronze cedar color we used is beautiful. It looked nice after the 1st coat, but absolutely gorgeous after the 2nd coat. Water beads up on it after a rain shower and the product is warranted to hold up for up to 6 years on horizontal surfaces. The customer service rep was very helpful and I ordered 4 different color samples to try out. I would not be put off by its cost as this is a product meant to protect your deck for years. It’s worth every cent (and you get what you pay for)! Also, the estimated coverage per gallon was really accurate, so I did not have to spend money on sealer I did not use.

  3. Sheryl W.

    Used to seal wood in a greenhouse to make it last longer. The product is working as described.

  4. Bob B.

    Well worth it…works great. Goes on much easier than oil-based sealer and really works

  5. Ralph H.

    Have used Nano Guard in the past with good results and was happy with the new NANO+POLY formula we used on our deck.

  6. JOHN S. (verified owner)

    I have used many of the other brands over the years and nothing comes close to what Seal-Once Nano+Poly does. Water beads up like the wood is wax coated, not slippery at all. I am a first time user we will have to wait a year or so to see if it holds up but for now, it really is impressive.

  7. Tobias

    We used this product to seal our pool deck for the summer and were glad we called and talked to Matt. We had originally been looking at the Marine product, but after talking to Matt and understanding the NANO+POLY has the added polyurethane component that gives increased protection in high traffic areas, we went with this. Our deck gets a lot of abuse from the kids and their toys, so we definitely need that added layer of surface protection you don’t get with the Marine.

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For customers outside of the United States, please contact our Customer Service department at 1-716-833-9366 to place an order.

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