---
product_id: 23682665
title: "SEAL-ONCE NANO+POLY Penetrating Wood Sealer with Polyurethane - 1 Gallon. Water-based, Low-VOC, waterproofer & stain for decks, fences & log homes."
brand: "seal-once"
price: "€ 200.83"
currency: EUR
in_stock: true
reviews_count: 10
category: "Seal Once"
url: https://www.desertcart.nl/products/23682665-seal-once-nano-poly-penetrating-wood-sealer-with-polyurethane-1
store_origin: NL
region: Netherlands
---

# Fast-drying with ultra-low VOC Water-based, eco-friendly formula Penetrates deep for lasting protection SEAL-ONCE NANO+POLY Penetrating Wood Sealer with Polyurethane - 1 Gallon. Water-based, Low-VOC, waterproofer & stain for decks, fences & log homes.

**Brand:** seal-once
**Price:** € 200.83
**Availability:** ✅ In Stock

## Summary

> 🛡️ Seal once, protect forever — your wood’s new best friend!

## Quick Answers

- **What is this?** SEAL-ONCE NANO+POLY Penetrating Wood Sealer with Polyurethane - 1 Gallon. Water-based, Low-VOC, waterproofer & stain for decks, fences & log homes. by seal-once
- **How much does it cost?** € 200.83 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/23682665-seal-once-nano-poly-penetrating-wood-sealer-with-polyurethane-1)

## Best For

- seal-once enthusiasts

## Why This Product

- Trusted seal-once brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Eco-Smart & Odorless:** Water-based, ultra-low VOC formula safe for pets, plants, and people.
- • **UV-Stable & Flexible:** Protects wood from sun damage while allowing natural aging and breathability.
- • **Effortless Application:** Fast-drying with easy soap-and-water cleanup—perfect for busy pros.
- • **Deep Penetration Shield:** Creates a water-resistant barrier beneath the surface, not just a topcoat.
- • **Versatile Outdoor Armor:** Ideal for decks, fences, log homes, and outdoor furniture in high-traffic zones.

## Overview

Seal-Once NANO+POLY is a premium water-based polyurethane wood finish designed for professional-grade protection. Its deep-penetrating, waterproof formula forms a flexible, UV-stable barrier that guards wood surfaces against wear, weather, and water damage. With ultra-low VOCs and odorless application, it’s safe for use around homes, pets, and plants. Fast-drying and easy to clean, this sealer enhances wood’s natural beauty while extending its lifespan—perfect for decks, fences, log homes, and outdoor furniture.

## Description

Buy SEAL-ONCE NANO+POLY Penetrating Wood Sealer with Polyurethane - 1 Gallon. Water-based, Low-VOC, waterproofer & stain for decks, fences & log homes.: Everything Else - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Get the second coat on while first coat is damp. - Great stuff! Applied to our bare pine ranch table and benches. It goes a long way and the finish is nice, showing the wood grain and color, though slightly milky. You wouldn't know it if I didn't tell you. I light sanded the wood, vacuumed and wiped down with a wet tack cloth. The sealant goes on easily with a brush and a little goes a long way. Didn't use 1/2 gallon to cover a 120" x 40' table and two 108" x 16" benches, top, bottom and legs with two coats! It did require two people to get the second coat down (instructions said to apply second coat when first is damp), as in the Arizona heat, it was drying pretty fast. The ranch table is out on the covered patio and now I can wipe the dust off in minutes. I'm very please with this product.
Review: it is water proof - it is water proof. there is not much review online for this product, but I went ahead and gave it try. I used it to paint the my deck floor. it turns out great. when it rains, i can see that the water beads up and runs off, instead of soaking in the wood. love it!!

## Features

- WATER-BASED POLYURETHANE WOOD FINISH: Our sealant provides top-notch protection against wear and tear in high traffic areas. It's odorless and ideal for use on wood siding, log homes, swing sets, outdoor furniture, wooden deck and fence, and more.
- WOOD SEALANT: Unlike many sealers that only form a topcoat, our protector penetrates below the surface to create a long-lasting, water-resistant shield around the wood. It helps protect against the elements.
- FLOOR SEALER APPLICATOR: Our premium gloss is ultra-low VOC and great for enhancing the extended life of your exterior flooring. The sealant can be safely applied around your home, landscaping, vegetation, or over any water area.
- WATERPROOF SEALER: Ditch the oil-based sealers and choose a UV-stable coating option. Our fast-drying liquid creates a flexible, breathable barrier and provides a no-fuss, easy clean-up with soap and water, as it allows the wood to grey naturally.
- SEAL-ONCE: Our user-friendly wood sealers and stains are an effective way to protect your lumber or concrete against water damage. When you use Seal-Once, you have the satisfaction of knowing our products will not harm pets, plants, or people.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B015C8AC1Q |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #23,341 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #92 in Hardware Sealers |
| Brand | Seal-Once |
| Color | Clear |
| Customer Reviews | 4.3 4.3 out of 5 stars (1,333) |
| Date First Available | August 31, 2015 |
| Is Discontinued By Manufacturer | No |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Item Weight | 8.73 pounds |
| Item dimensions L x W x H | 7 x 7 x 9 inches |
| Item model number | SOP 500G |
| Manufacturer | U-C Coatings |
| Material | Wood |
| Number of Items | 1 |
| Part Number | SO7500 |
| Product Dimensions | 7 x 7 x 9 inches |
| Size | 1 Gallon |
| Style | Protection |
| Surface Recommendation | Floor,Furniture,Siding,Wood |
| UPC | 854734005042 |
| Unit Count | 128 Fluid Ounces |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Seal-Once
- **Item Weight:** 8.7 Pounds
- **Item dimensions L x W x H:** 7 x 7 x 9 inches
- **Material:** Wood
- **Style:** Protection

## Images

![SEAL-ONCE NANO+POLY Penetrating Wood Sealer with Polyurethane - 1 Gallon. Water-based, Low-VOC, waterproofer & stain for decks, fences & log homes. - Image 1](https://m.media-amazon.com/images/I/81wAqrTQlgL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Questions & Answers

**Q: do you need to sand the wood first to make it smooth before applying the sealer?**
A: Sanding exterior wood "smooth" is a very bad idea.  Exterior wood needs to be sanded to open up the pores of the wood for deeper penetration. Sand with 80 grit sandpaper, nothing finer. Most times, cleaning with Seal-Once All Wood Cleaner would be a better choice. It would also depend on the type of wood and the project.......... siding or deck, exterior furniture? Call us.

**Q: What is the difference in the Nano+Poly and the Marine?**
A: I believe that the marina stain is has a special formula for freshwater and saltwater

**Q: Should i use wood putty/filler before sealing or after sealing by seal-once nano+poly?**
A: Use a top-quality name-brand stainable/paintable outdoor (or interior-exterior) wood filler of genuine wood fibers that will provide expansion and contraction with the surrounding wood. Fill no more than 1/8th to 1/4” per layered application until flush with the surrounding surface--allow ample time for each layer to cure. Sand top layer flush. If choosing to stain, do so next to match if surrounding hue. After the final stain coat dries, apply 1-3 liberal coats of wood hardener, allowing it to dry between each application. If panting, skip stain and then paint over the top coat of dried wood hardener. It should last for the life of the wood in most cases.

**Q: Can this be applied with a sprayer?  thanks**
A: Yes, but you must immediately back brush.   Brush the area that you just sprayed. Apply the second coat while the first coat is still wet.  Within 5-15 minutes.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Get the second coat on while first coat is damp.
*by M***N on May 8, 2025*

Great stuff! Applied to our bare pine ranch table and benches. It goes a long way and the finish is nice, showing the wood grain and color, though slightly milky. You wouldn't know it if I didn't tell you. I light sanded the wood, vacuumed and wiped down with a wet tack cloth. The sealant goes on easily with a brush and a little goes a long way. Didn't use 1/2 gallon to cover a 120" x 40' table and two 108" x 16" benches, top, bottom and legs with two coats! It did require two people to get the second coat down (instructions said to apply second coat when first is damp), as in the Arizona heat, it was drying pretty fast. The ranch table is out on the covered patio and now I can wipe the dust off in minutes. I'm very please with this product.

### ⭐⭐⭐⭐⭐ it is water proof
*by 0***7 on January 23, 2026*

it is water proof. there is not much review online for this product, but I went ahead and gave it try. I used it to paint the my deck floor. it turns out great. when it rains, i can see that the water beads up and runs off, instead of soaking in the wood. love it!!

### ⭐⭐⭐⭐ Goes on quickly, dries quickly, water runs off.
*by M***. on May 9, 2025*

Bought the gray tint. Must have changed the lid as mine came with 4 metal clips holding the lid down. Pop off the clips and it opened like a regular can of paint. Shook it well & used a stir stick. I could feel a layer of … thickness on the bottom of the can, it was bumpy and if I pressed hard I could get a little of it up stuck to my stick. It would NOT stir in. I was concerned that the water seal ability would be impacted & tested it on a piece of wood. It does not seem to impact water proofing. Easy to apply. As others have stated, you MUST go back & put on the 2nd coat within about 20 minutes; if you don’t the 2nd coat just beads up & runs off. Had a couple places with knots in the wood & it took the color differently, lighter, so I went back after about 30 minutes to give it another coat (already had 2 coats on it) but it was too late, stain just beaded up & ran off. Consistency is like water, I was doing trim with some of it above my head - runs down your arm, drips on everything - just know this & be careful. I had two ladders set up, by the time I’d painted as far as I could reach on 2nd ladder (it goes on fast!) I would go back to the first & put on the 2nd coat. Easy clean-up. Took a star because of the sludge on the bottom, which I hope does not impact the longevity of the product.

## Frequently Bought Together

- Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant -1 Gallon & Clear
- Pro Grade, Paint Brushes, 5-Piece, Paint Brush Set: Flat & Angle Brushes for Latex and Oil Paints, Stains, Interior & Exterior Home Improvement
- Double Thick Chip Paint Brush - Wood Stain Brushes for Painting Walls and Fence Staining - Wooden Handle Masonry Paintbrush for Varnish, Paste, Gesso and Limewash (4 inch)

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-03-03*