---
product_id: 604933557
title: "Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant - 5 Gallon & Coastal Gray"
brand: "seal-once"
price: "¥165509"
currency: JPY
in_stock: true
reviews_count: 6
url: https://www.desertcart.jp/products/604933557-seal-once-nano-poly-penetrating-wood-sealer-with-polyurethane-premium
store_origin: JP
region: Japan
---

# Eco-Friendly, Low VOC Formula Waterproof Polyurethane Shield Deep Penetrating Wood Protection Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant - 5 Gallon & Coastal Gray

**Brand:** seal-once
**Price:** ¥165509
**Availability:** ✅ In Stock

## Summary

> 💼 Seal your style with the pro-grade waterproof shield your wood deserves!

## Quick Answers

- **What is this?** Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant - 5 Gallon & Coastal Gray by seal-once
- **How much does it cost?** ¥165509 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/604933557-seal-once-nano-poly-penetrating-wood-sealer-with-polyurethane-premium)

## 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-Conscious & Odorless:** Water-based, ultra-low VOC formula safe for pets, plants, and people—no harsh fumes.
- • **Easy Application & Cleanup:** Fast-drying with soap-and-water cleanup—perfect for busy pros and DIYers alike.
- • **Deep Penetration Technology:** Seals beneath the surface for long-lasting protection, not just a surface coat.
- • **Ultimate Waterproof Defense:** Creates a flexible, breathable barrier that repels water and resists wood damage.
- • **Versatile Coastal Gray Finish:** Modern, premium gloss enhances wood siding, decks, fences, and outdoor furniture.

## Overview

Seal-Once Nano+Poly is a premium 5-gallon water-based polyurethane wood sealer in Coastal Gray, designed for deep penetration and long-lasting waterproof protection. Its ultra-low VOC, odorless formula is safe for outdoor use around plants and pets, enhancing wood surfaces like decks, fences, and furniture with a durable, flexible finish that naturally ages while resisting wear and UV damage.

## Description

Full description not available

## 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 resist wood damage, deterioration, and protects 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 |
|---------------|-------|
| Material | Polyurethane |
| Brand | Seal-Once |
| Style | Modern |
| Item dimensions L x W x H | 10 x 4 x 10 inches |
| Compatible Material | Wood |
| Water Resistance Level | Waterproof |
| Item Form | Liquid |
| UPC | 860010338742 |
| Unit Count | 1.0 Count |
| Number of Items | 1 |
| Color | Coastal Gray |
| Surface Recommendation | Furniture,Siding,Wood |
| Manufacturer | UC Coatings |
| Part Number | SO8527 |
| Product Dimensions | 10 x 4 x 10 inches |
| Country of Origin | USA |
| Item model number | SO8527 |
| Size | 5 Gallon |
| Included Components | Wood Sealer with Polyurethane |
| Batteries Required? | No |

## Product Details

- **Material:** Polyurethane
- **Brand:** Seal-Once
- **Style:** Modern
- **Item dimensions L x W x H:** 10 x 4 x 10 inches
- **Compatible Material:** Wood

## Images

![Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant - 5 Gallon & Coastal Gray - Image 1](https://m.media-amazon.com/images/I/71DbO4m+0XL.jpg)
![Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant - 5 Gallon & Coastal Gray - Image 2](https://m.media-amazon.com/images/I/91jIbWCF5cL.jpg)

## Available Options

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

## 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.

### ⭐⭐⭐⭐⭐ Absolutely gorgeous color!
*by K***L on July 19, 2025*

I had read the mixed reviews but was still wanting to give this a shot and I’m so glad I did. I’m still staining my ironwood boards but the look is phenomenal. I’ll certainly add some more photos after it’s fully dry but even if it lightens up considerably, I’m still super happy with it.A few things to note:1) I’ve been mixing it often (keeping the mixer on hand just to make sure the color stays even).2) my ironwood was really dry. I washed it with the nano wash (day 1) and then did a thorough water-only wash the following day. I let it sit for a week…3) I’ve got 24 ten-foot board (6” boards) so 120 sq feet per side plus the edges which is maybe 250 sq feet. I was able to coat all of it with one gallon and I also used a bit on some small old benches but I used that entire gallon! So, as others have mentioned, I think 250-300 sq feet per gallon is closer to realistic! I bought two gallons but I’m going to do a touch up coat and finish the small benches as well. I highly recommend this product, it’s just thick and my wood has really soaked it up!The color of bronze cedar is gorgeous!Photos: wood drying in paint rack setup (highly recommend), stained board next to unstained board on (plastic) horses, stained boards drying on rack system (on ground) with boards left to stain in the background! A before / after of the small benches (note: no spray paint was used; those were my weights to hold down the plastic bags).I’ll try to post an update once this has fully dried and the gate is back in place as well as an update after 6 months. I have very high hopes for this product.

### ⭐⭐⭐⭐ Good quality marine varnish.
*by M***H on July 20, 2025*

The varnish looks to be very good quality [we will know after a winter or two]. Goes on easily, yet washes out of the paint brush. My only reservation is that it seems to take a long time to cure. Two days after application, and it still seems a little sticky.

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**Shop now:** [https://www.desertcart.jp/products/604933557-seal-once-nano-poly-penetrating-wood-sealer-with-polyurethane-premium](https://www.desertcart.jp/products/604933557-seal-once-nano-poly-penetrating-wood-sealer-with-polyurethane-premium)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-01-23*