do you need to sand the wood first to make it smooth before applying the sealer?

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.

What is the difference in the Nano+Poly and the Marine?

I believe that the marina stain is has a special formula for freshwater and saltwater

Should i use wood putty/filler before sealing or after sealing by seal-once nano+poly?

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.

Can this be applied with a sprayer? thanks

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.

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NANO + POLY

Product ID: 23682665

Details

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

🌞UV-stable, flexible & breathable barrier

💧Water-based, eco-friendly formula

🛡️Penetrates deep for long-lasting protection

1192 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Romania.

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Description

🛠️ Seal smart, protect longer — your wood’s best defense against time and elements!

CUSTOMIZABLE AESTHETIC - Available in 9 semi-transparent tints to elevate your wood’s natural beauty with style.
ECO SMART ULTRA LOW VOC - Safe for your home, pets, and plants with a virtually odorless, water-based formula.
10 YEAR VERTICAL PROTECTION - Backed by a decade-long warranty on vertical surfaces—peace of mind that lasts.
EFFORTLESS APPLICATION CLEANUP - Fast-drying, soap-and-water cleanup means no hassle, just flawless finish.
DEEP PENETRATION NOT JUST SURFACE - Creates a durable, water-resistant shield beneath the wood surface for unmatched longevity.

Seal-Once Nano+Poly Wood Sealer is a premium water-based, low-VOC wood finish that penetrates deeply to provide a flexible, UV-stable, and waterproof barrier. Ideal for decks, fences, and log homes, it offers up to 10 years of protection on vertical surfaces and 6 years on horizontal ones. With easy soap-and-water cleanup and 9 tint options, it combines eco-friendly innovation with customizable style for lasting wood preservation.

Specifications

ASIN	B015C8AC1Q
Best Sellers Rank	#6,781 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #45 in Hardware Sealers
Brand	Seal-Once
Brand Name	Seal-Once
Color	Clear
Compatible Material	Wood
Customer Reviews	4.3 out of 5 stars 1,508 Reviews
Item Dimensions	7 x 7 x 9 inches
Item Form	Liquid
Item Weight	8.7 Pounds
Item dimensions L x W x H	7 x 7 x 9 inches
Manufacturer	U-C Coatings
Material	Wood
Material Type	Wood
Model	SOP 500G
Number of Items	1
Part Number	SO7500
Style	Protection
Style Name	Protection
Surface Recommendation	Floor,Furniture,Siding,Wood
UPC	854734005042
Unit Count	128 Fluid Ounces
Water Resistance Level	Waterproof

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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1192 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Romania.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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