---
product_id: 447236678
title: "Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant -1 Gallon & Clear"
brand: "seal-once"
price: "₨23148"
currency: LKR
in_stock: false
reviews_count: 5
url: https://www.desertcart.lk/products/447236678-seal-once-nano-poly-penetrating-wood-sealer-with-polyurethane-premium
store_origin: LK
region: Sri Lanka
---

# UV-stable, flexible breathable barrier Water-based polyurethane for eco-safe protection Penetrates deep for 10 years vertical, 6 years horizontal Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant -1 Gallon & Clear

**Brand:** seal-once
**Price:** ₨23148
**Availability:** ❌ Out of Stock

## Summary

> 🛠️ Seal smart, live stylish: Protect your wood like a pro!

## Quick Answers

- **What is this?** Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant -1 Gallon & Clear by seal-once
- **How much does it cost?** ₨23148 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/447236678-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-Safe & Odorless:** Water-based formula with ultra-low VOCs, safe for pets, plants, and people—no toxic fumes.
- • **Long-Lasting Shield:** Protects vertical surfaces up to 10 years and horizontal surfaces up to 6 years from rot, mold, and wear.
- • **360° Nano-Poly Protection:** Advanced nanotech penetrates wood fibers for unmatched water resistance and durability.
- • **UV-Stable & Flexible Finish:** Preserves natural wood color while preventing cracking, peeling, and warping under harsh sunlight.
- • **Easy Application & Maintenance:** Milky white drying clear with soap-and-water cleanup; ideal for decks, fences, furniture, and more.

## Overview

Seal-Once Nano+Poly is a premium water-based polyurethane wood sealer that uses proprietary nanotechnology to penetrate deep into wood fibers, creating a durable, flexible, and UV-stable barrier. It offers up to 10 years of protection on vertical surfaces and 6 years on horizontal ones, preventing water damage, rot, mold, and warping. Safe for people, pets, and plants, this eco-friendly sealer dries clear, enhances natural wood grain, and is easy to apply and maintain, making it the ultimate choice for long-lasting wood protection.

## Description

SEAL-ONCE NANO+POLY is the safest way to protect & enhance your investment & extend the natural life of wood. This premium water-based, wood protector combines proprietary nanotechnology with the strength of polyurethane to provide 360° of protection. Protects up to 10 years on vertical surfaces & 6 years on horizontal with no toxic chemicals, making it easy to apply and safe for people, pets & plants. Unlike many brands that only form a top-coat, NANO+POLY penetrates wood to form a long-lasting water-resistant shield around the wood fibers, preventing rot, decay, mold & mildew. It also stabilizes wood, eliminating warping and cupping. With the added POLY, NANO+POLY also creates a durable surface coating that protects against wear and tear, UV fading and water damage. NANO+POLY is a water-based, eco-safe sealer that goes on milky white & dries clear. It creates a UV-stable coating that preserves the natural color of the wood and resists weathering and decay. It is also available in 11 semi-transparent color tints that provide added UV protection. Battleship Gray, Black, Bronze Cedar, Brown, Cape Cod Gray, Cedar, Light Brown, Mahogany, Natural, Redwood & Shale Gray. Recommended Applications • Decks • Railings • Wood siding • Log homes • Thermally modified wood • Docks • Piers • Fences • Exposed beams • Outdoor furniture • Planters • Play structures • Cedar shingles. Typical sealers form a barrier on the surface, trapping moisture below the surface. As water evaporates, it causes the surface coating to crack & peel, leaving a surface that requires continued maintenance. SEAL-ONCE protects against water damage, using proprietary nanotechnology that penetrates deep into the wood and bonds to the wood fibers and cells at a microscopic level. SEAL-ONCE protects from the inside out to provide unparalleled protection & stability for wood. The flexible, breathable barrier created by SEAL-ONCE, allows water vapor to escape while preventing damage caused by water intrusion.

Review: 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: The product was easy to apply, but one needs to be very aware of the 20-30 minute time between first and second coats. Break the deck area down into smaller sections the size that you can apply the first coat in the time period but an area that you will be able to fully reach in order to apply the second coat. I used a brush which allowed me to really work the product in real well to obtain the best penetration on the first coat. My deck is Western Red Cedar which is a very porous and absorbs well so I needed to make sure to apply enough on the first coat to ensure a full penetration seal. The next most critical thing is to keep the leading edge of your application live or you will get a line between the the application stages. I live in the interior of British Columbia in Canada. Winters are long, wet, snowy and cold. Summers are hot and dry. All products that I have used in the past never make it through a single season. I apply them in May - June and they are gone by the end of December. I always have to fully sand and refinish every spring. Claims for Seal-Once Nano + Poly suggest I should get multiple years of use with out refinishing. Only time will tell. I am very hopeful but the jury is still out, as I only just finished the sealing.

## Features

- May cause respiratory irritation.
- 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.
- 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 Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 653,483 in DIY & Tools ( See Top 100 in DIY & Tools ) 5,530 in Sealers |
| Colour | Clear |
| Coverage | 1 gallon |
| Customer Reviews | 4.4 4.4 out of 5 stars (631) |
| Date First Available | 31 Aug. 2015 |
| Finish | Gloss |
| Included components | SEAL-ONCE NANO+POLY Penetrating Wood Sealer with Polyurethane - 1 Gallon. Water- |
| Item Package Quantity | 1 |
| Item Weight | 3.96 kg |
| Item model number | SOP 500G |
| Manufacturer | U-C Coatings |
| Material | Polyurethane |
| Part number | SO7500 |
| Product Dimensions | 17.78 x 17.78 x 22.86 cm; 3.96 kg |
| Size | 1 Gallon |
| Style | Protection |

## Product Details

- **Brand:** Seal-Once
- **Item dimensions L x W x H:** 17.8 x 17.8 x 22.9 centimetres
- **Item weight:** 8.73 Pounds
- **Material:** Polyurethane
- **Style:** Protection

## Images

![Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant -1 Gallon & Clear - Image 1](https://m.media-amazon.com/images/I/519v2KHipzL.jpg)
![Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant -1 Gallon & Clear - Image 2](https://m.media-amazon.com/images/I/51CbaAGYsiL.jpg)
![Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant -1 Gallon & Clear - Image 3](https://m.media-amazon.com/images/I/51UXE+8OAEL.jpg)
![Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant -1 Gallon & Clear - Image 4](https://m.media-amazon.com/images/I/51Z5C5VlKIL.jpg)
![Seal-Once Nano+Poly Penetrating Wood Sealer with Polyurethane - Premium Waterproof Sealant -1 Gallon & Clear - Image 5](https://m.media-amazon.com/images/I/51fKcs4sG8L.jpg)

## 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

### ⭐⭐⭐⭐⭐ Review
*by M***N on 8 May 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.

### ⭐⭐⭐⭐⭐ Review
*by P***A on 21 May 2023*

The product was easy to apply, but one needs to be very aware of the 20-30 minute time between first and second coats. Break the deck area down into smaller sections the size that you can apply the first coat in the time period but an area that you will be able to fully reach in order to apply the second coat. I used a brush which allowed me to really work the product in real well to obtain the best penetration on the first coat. My deck is Western Red Cedar which is a very porous and absorbs well so I needed to make sure to apply enough on the first coat to ensure a full penetration seal. The next most critical thing is to keep the leading edge of your application live or you will get a line between the the application stages. I live in the interior of British Columbia in Canada. Winters are long, wet, snowy and cold. Summers are hot and dry. All products that I have used in the past never make it through a single season. I apply them in May - June and they are gone by the end of December. I always have to fully sand and refinish every spring. Claims for Seal-Once Nano + Poly suggest I should get multiple years of use with out refinishing. Only time will tell. I am very hopeful but the jury is still out, as I only just finished the sealing.

### ⭐⭐⭐⭐ Review
*by K***N on 19 August 2023*

Seal once brushes on easy and does not change color of wood. What is most satisfying is that when it rains you can see the water just laying on the surface as it will not penetrate wood.

## 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 Sri Lanka*
*Store origin: LK*
*Last updated: 2026-01-23*