How would I know when to reapply Nano again when used in outdoor railing? This product dries clear and provides a raw wood finish.

Sprinkle some water on the wood - if it still beads up then the product is still working. If it soaks in then clean the wood and let dry prior to a new application. I hope this helps. Norkan Inc.

What is the coolest temperature outside that I can still apply this? Are the directions written anywhere online?

Seal-Once.com Don't use below 50 F . Be sure your wood is dry

If you apply one coat to both sides of 3/4 plywood do I need a second coat?

Yes, Apply the second coat within 15 minutes of the first coat. You cannot apply stain, paint ,varnish or glue over Seal-Once products. They will bead up and roll off. Seal -Once products are for exterior use. Clear will allow the wood to grey naturally.

Is nano best choice for new cedar boards supporting storage shed? boards rest on cinder blocks completely open to outside all around.

Nano is a great choice. Clear will allow the wood to grey naturally. Before application sand the boards with 80 grit sandpaper, nothing finer. That will open up the pores of the wood for deeper penetration.

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🛡️ Seal it once, protect it forever—because your wood deserves the best!

ECO SMART ODORLESS - Water-based, ultra-low VOC formula means no harsh fumes—perfect for sensitive spaces.
UV STABLE PROTECTION - Keeps your wood looking natural while defending against sun damage and weathering.
VERSATILE OUTDOOR GUARDIAN - Ideal for decks, fences, log homes, and outdoor furniture—protect your investment everywhere.
INVISIBLE ARMOR FOR YOUR WOOD - Penetrates beneath the surface to lock out water and wear, not just a surface coat.
EFFORTLESS APPLICATION CLEANUP - Fast-drying liquid that cleans up easily with soap and water—no mess, no stress.

Seal-Once Nano Penetrating Wood Sealer is a premium, water-based polyurethane sealant designed to deeply protect wood surfaces with a waterproof, UV-stable barrier. This 1-gallon clear sealant offers 128 fluid ounces of odorless, ultra-low VOC protection that penetrates beneath the surface for long-lasting durability on decks, fences, and outdoor wood structures. Fast-drying and easy to clean with soap and water, it enhances wood’s natural look while defending against wear, water damage, and sun exposure.

€ 286.15

Duties & taxes incl.

French Guianastore

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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Material	Polyurethane
Brand	Seal-Once
Style	Clear
Item Weight	8.84 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	850336001000
Unit Count	128 Fluid Ounces
Number of Items	1
Color	Clear
Surface Recommendation	Deck
Manufacturer	UC Coatings
Part Number	SO7214
Item Weight	8.84 pounds
Product Dimensions	7 x 7 x 9 inches
Item model number	SO8214
Is Discontinued By Manufacturer	No
Size	1 Gallon
Finish	Unfinished
Item Package Quantity	1
Included Components	One Premium Waterproof Sealant
Batteries Included?	No
Batteries Required?	No

Seal-Once Nano Penetrating Wood Sealer - Premium Waterproof Sealant - 1 Gallon Clear Wood Sealant

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