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 Wood Sealer and Waterproofer, Clear, 1 Gallon | With Polyurethane, Water-based, Low-VOC, Waterproofer & Stain, For Decks, Fences & Log Homes

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

⚡Fast-drying, flexible, breathable waterproof barrier

🌿Ultra-low VOC, eco-friendly & safe for plants and pets

💧Water-based polyurethane for deep wood protection

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Description

💪 Seal your wood’s future with Nano+Poly power!

ECO SMART LOW ODOR - Water-based formula with ultra-low VOC keeps your outdoor spaces fresh and safe for family and environment.
VERSATILE OUTDOOR ARMOR - Ideal for decks, fences, log homes, and outdoor furniture, enhancing longevity in high-traffic, weather-exposed areas.
UV STABLE FLEXIBLE FINISH - Protects wood from sun damage while allowing natural aging, maintaining beauty without cracking or peeling.
DEEP PENETRATION LASTING SHIELD - Unlike surface-only sealers, Nano+Poly penetrates wood fibers for superior water resistance and durability.
EFFORTLESS APPLICATION CLEANUP - Fast-drying liquid cleans up easily with soap and water—no harsh chemicals or oily residues.

SEAL-ONCE Nano+Poly Wood Sealer is a premium water-based polyurethane formula designed to deeply penetrate and waterproof wood surfaces. With ultra-low VOCs and a fast-drying, UV-stable finish, it offers durable protection for decks, fences, and log homes while being safe for pets, plants, and people. This clear sealer enhances wood longevity by creating a flexible, breathable barrier that resists wear, weather, and water damage—all with easy soap-and-water cleanup.

Specifications

ASIN	B015C8AC1Q
Best Sellers Rank	#6,242 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #47 in Hardware Sealers
Brand Name	Seal-Once
Color	Clear
Compatible Material	Wood
Customer Reviews	4.3 4.3 out of 5 stars (1,485)
Item Dimensions	7 x 7 x 9 inches
Item Form	Liquid
Item Weight	8.7 Pounds
Manufacturer	U-C Coatings
Material Type	Wood
Model	SOP 500G
Number of Items	1
Part Number	SO7500
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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€ 136.90

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

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