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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🛡️ Seal smart, live stylish: Protect your wood, protect your vibe.

ECO CHIC ODORLESS - Water-based formula with ultra-low VOCs keeps your space fresh and safe for family and pets.
UV STABLE FLEXIBLE - Protects wood from sun damage while allowing natural aging with a breathable, flexible barrier.
NEXT LEVEL WOOD DEFENSE - Penetrates beneath the surface for long-lasting water resistance, not just a surface coat.
VERSATILE OUTDOOR ARMOR - Perfect for decks, fences, log homes, and outdoor furniture—upgrade your wood’s lifespan in style.
EFFORTLESS APPLICATION CLEANUP - Fast-drying liquid cleans up easily with soap and water—no harsh chemicals needed.

SEAL-ONCE NANO+POLY is a 1-gallon, water-based polyurethane wood sealer designed for professional-grade protection. It penetrates deeply to create a durable, waterproof barrier that resists UV damage and wear, while being ultra-low VOC and safe for plants, pets, and people. Ideal for decks, fences, log homes, and outdoor wood surfaces, it offers a matte finish with easy soap-and-water cleanup, combining high performance with eco-conscious innovation.

€ 175.65

Duties & taxes incl.

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Material	Wood
Brand	Seal-Once
Style	Protection
Item Weight	8.7 Pounds
Item dimensions L x W x H	7 x 7 x 9 inches
Compatible Material	Wood
Water Resistance Level	Waterproof
Item Form	Liquid
UPC	854734005042
Unit Count	128 Fluid Ounces
Color	Clear
Surface Recommendation	Floor,Furniture,Siding,Wood
Manufacturer	U-C Coatings
Part Number	SO7500
Item Weight	8.73 pounds
Product Dimensions	7 x 7 x 9 inches
Item model number	SOP 500G
Is Discontinued By Manufacturer	No
Size	1 Gallon
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

SEAL-ONCE NANO+POLY Penetrating Wood Sealer with Polyurethane - 1 Gallon. Water-based, Low-VOC, waterproofer & stain for decks, fences & log homes.

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