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

⚡Fast-drying with ultra-low VOC

💧Water-based, eco-friendly formula

🛡️Penetrates deep for lasting protection

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R$1524

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
Seal-Once
Item Weight
8.7 Pounds
Item dimensions L x W x H
7 x 7 x 9

Description

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

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.

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.

Specifications

ASIN	B015C8AC1Q
Best Sellers Rank	#6,042 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #44 in Hardware Sealers
Brand	Seal-Once
Brand Name	Seal-Once
Color	Clear
Compatible Material	Wood
Customer Reviews	4.2 out of 5 stars 1,455 Reviews
Item Dimensions	7 x 7 x 9 inches
Item Form	Liquid
Item Weight	8.73 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

Reviews

M**N

8.05.2025

P**3

12.11.2020

M**.

9.05.2025

M**T

28.02.2026

W**E

15.02.2026

B**K

26.07.2025

J**B

12.04.2026

M**P

12.04.2026

P**A

21.05.2023

R**T

28.04.2026

K**N

19.08.2023

J**.

16.04.2026

D**Y

15.05.2025

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