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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Description

🛠️ Seal your space, save your style — marine-grade protection that lasts!

LONG LASTING SHIELD - Provides up to 10 years of protection on vertical surfaces and 6 years on horizontal surfaces.
ECO CONSCIOUS FORMULA - Water-based and ultra-low VOC, safe for pets, plants, and aquatic life—no compromises on safety.
ALL IN ONE WOOD SAVIOR - Seals, stains, and finishes in a single fast-drying application for effortless maintenance.
ULTIMATE MARINE DEFENSE - Protects wood from saltwater spray and harsh elements with a durable UV-stable coating.
VERSATILE OUTDOOR ESSENTIAL - Ideal for furniture, docks, porches, and railings, enhancing natural wood beauty with a satin bronze cedar finish.

Seal-Once Marine Premium Wood Sealer is a 5-gallon, water-based polyurethane formula designed to protect outdoor wood surfaces from water damage, UV rays, and saltwater exposure. Featuring a natural satin bronze cedar finish, it seals, stains, and finishes wood in one fast-drying coat, offering up to 10 years of vertical surface protection. Eco-friendly and safe for aquatic environments, this sealer is perfect for furniture, docks, porches, and railings, delivering durable, breathable, and flexible protection with easy soap-and-water cleanup.

Specifications

Color	Bronze Cedar
Brand	Seal-Once
Surface Recommendation	Furniture, Porch, Railings
Material	Polyurethane
Model Name	Marine Premium Wood Sealer
Size	5 Gallon
Coating Description	Water-based
Item dimensions L x W x H	14 x 14 x 17 inches
Finish Type	Natural/Satin
Style	Outdoor
Liquid Volume	18927.1 Milliliters
Paint Type	Water Based
Package Information	Pail
Warranty Type	Limited
Number of Items	1
Manufacturer	UC Coatings
Unit Count	640.0 Fluid Ounces
UPC	655368938283
Part Number	SO8624
Item Weight	44.1 pounds
Product Dimensions	14 x 14 x 17 inches
Item model number	SO8624
Finish	Natural/Satin
Coverage	up to 10 years for vertical surfaces and up to 6 years for horizontal surfaces
Included Components	1 Wood sealer
Batteries Included?	No
Batteries Required?	No

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