Can it be used on green treated lumber

Pressure treated lumber has to be dry.

Can you use a regular wood stain after applying?

Yes the clear MARINE can be painted or stained. Or you can purchase a tint for SEAL-ONCE and use the MARINE as a sealer and stain. MARINE Features: • Clear formula can be painted or stained after treatment • Tinted formula provides additional UV protection • Available in 11 semi-transparent tint colors • Eco-friendly, Non-toxic; will not harm pets, plants, people or marine life • Ultra-low VOC, Water based • Can be applied around or over fresh or salt water • Flexible, breathable barrier, Stabilizes & protects wood • Prevents warping, cupping, wood rot & decay • Resistant to salt water spray • Prevents mold, mildew & algae growth • Soap and water cleanup

I want to use this on a 6x6 wood beam at the opening to my walk-in shower (floor to ceiling). No direct shower spray. Will this seal it?

Yes you may use it for this specific application. As suggested in a comment down bellow, you would want to make sure that it is fully cured before using the shower. Typically it would take 48 hours to cure but it may take longer depending on the environment.

does this work for the interior of a sauna , safe to sit on?

It dries to a hard, smooth finish, is non toxic and nice to look at. Would be safe to sit on...other types of recreation may require caution.

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Seal-Once Marine Waterproof Wood Sealer and Stain, Natural, 1 Gallon

Product ID: 296285150

Details

Brand
Seal-Once
Coating Description
Water-based
Color
Natural
Material
Wood
Surface Recommendation
Wood

⏳Up to 10 years vertical surface warranty

🌊UV-stable marine-grade protection

🛠️Water-based, ultra-low VOC formula

Description

🌟 Seal your space with marine-grade confidence—because your deck deserves the best!

ECO FRIENDLY SAFE - Water-based, ultra-low VOC formula that’s safe for pets, plants, and aquatic life during application.
EFFORTLESS MAINTENANCE - One product seals, stains, and finishes with easy soap-and-water cleanup—perfect for busy pros.
ULTIMATE MARINE SHIELD - Protects wood from saltwater spray and harsh elements with a UV-stable, waterproof barrier.
NATURAL AGING NO DECAY - Allows wood to age gracefully to a rich silver-gray while preventing rot, mold, and mildew stains.
DEEP CELLULAR PENETRATION - Fast-drying sealer penetrates wood fibers at the cellular level for long-lasting flexibility and breathability.

Seal-Once Marine Waterproof Wood Sealer and Stain is a premium, water-based polyurethane formula designed specifically for outdoor wood exposed to marine environments. It offers UV-stable, waterproof protection that penetrates deeply to shield wood fibers from saltwater, moisture, and decay. Safe for use over open water and non-toxic to aquatic life, this sealer extends the life of decks, docks, and siding with up to 10 years of vertical surface protection. Its natural finish ages wood beautifully while preventing mold and mildew, making it the go-to choice for professionals and homeowners seeking durable, eco-conscious wood care.

Specifications

ASIN	B08WNBKFYK
Base Material	Wood
Best Sellers Rank	#630,774 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,042 in Household Stains
Brand	Seal-Once
Brand Name	Seal-Once
Coating Description	Water-based
Color	Natural
Compatible Material	Wood
Container Type	Jug
Customer Reviews	4.4 out of 5 stars 87 Reviews
Finish Types	Natural
Item Dimensions	17 x 14 x 14 inches
Item Weight	3.98 kg
Item dimensions L x W x H	17 x 14 x 14 inches
Liquid Volume	1 gallons
Manufacturer	U C COATINGS
Manufacturer Part Number	SOMARINEWOOD
Material	Wood
Material Type	Wood
Model Number	SO7620FBA
Paint Type	Water Based
Recommended Uses For Product	Thermally modified wood, boat docks, flooring, siding, porch, decks, retaining walls
Surface Recommendation	Wood
UPC	759126974022
Unit Count	128 Fluid Ounces
Warranty Type	Time-based (Limited)

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