Can this be used under water?

Hey there, Thank you for reaching out. It technically can be used below the waterline but it's not recommended if the boat will see > 24 hours of submersion at a time

The label says it is "uv stable", what does that mean? does it provide uv protection?

Yes. Based on the description from Jamestown this is thinned varnish. Varnish has good UV protection but nothing last forever in the sun which is why varnish requires another couple coats every year. This is meant for the first couple of coats in about an 8 coat varnish job. Least that is how I use it. Your option is to thin your own or I have enough varnishing from bare wood that I bought this for convenience for the first couple coats then following with in my case Lust varnish also from Jamestown. I really like the Lust since I can overcoat again in about an hour versus a day for the other varnishes I had been using. Good luck!

Can total boat epoxy be used over the top of this?

I would not put epoxy over any sealer. ......

Is it a oil base water sealant or a stain coloring? What are the ingredients?

It is oil based and delivers a relatively clear coat that fills the wood grain quickly in preparation for varnish. However, you can add a solid stain directly to the sealer to get the “color” you desire.

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TotalBoat Marine Wood Sealer Varnish Primer

TotalBoat Marine Wood Sealer Varnish Primer

Product ID: 39364073

Details

Brand
TotalBoat
Finish Type
Gloss
Item Weight
0.95 kg
Liquid Volume
1 quarts
Material
Wood

⚡Fast drying, recoats in 2 hours

🎯Seals & smooths all wood types

🛡️UV protection down to wood grain

HK$723

Duties & taxes included

In stock

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Description

🛥️ Seal it right, shine all night — your wood’s new best friend!

SMOOTH LEVEL BASE - Fills and seals wood grain to create the perfect foundation for premium varnishes.
ULTIMATE UV DEFENSE - Protects wood fibers from cracking and varnish peeling for a flawless finish.
EFFORTLESS APPLICATION - Brush, roll, or spray with easy thinning options for interior and exterior use.
RAPID RECOAT TECHNOLOGY - Dries fast with no sanding needed between coats—get your project done faster.
UNIVERSAL WOOD COMPATIBILITY - Seals everything from plywood to oily hardwoods like teak and mahogany effortlessly.

TotalBoat Wood Sealer Pre Varnish Primer is a one-part, clear amber sealer designed to deeply penetrate and protect all types of bare wood, including oily hardwoods like teak. It provides superior UV protection that prevents cracking and varnish delamination, dries quickly allowing recoats in as little as 2 hours without sanding, and creates a smooth, sealed surface that maximizes the durability and appearance of your marine varnish finish. Ideal for both interior and exterior use, it covers 60-100 sq ft per quart and is compatible with all 1-part marine varnishes.

Specifications

ASIN	B01M0MZ89O
Best Sellers Rank	#39,861 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #26 in Paint Primers & Sealers
Brand Name	TotalBoat
Compatible Material	Engineered Wood, Wood
Coverage	60-100 sq ft per quart
Customer Reviews	4.6 4.6 out of 5 stars (406)
Finish Types	Gloss
Global Trade Identification Number	00811932022400
Included Components	Sealer
Item Form	Liquid
Item Weight	0.95 kg
Liquid Volume	1 quarts
Manufacturer	TotalBoat
Manufacturer Part Number	496580
Material Type	Wood
Number of Items	1
UPC	811932022400
Unit Count	32 Fluid Ounces

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