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 Wood Sealer

Product ID: 385213779

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Details

Brand
TotalBoat
Material
Wood
Finish Type
Gloss
Recommended Uses For Product
Interior
Liquid Volume
1 Quarts

⚡Fast drying, no sanding needed

🌲Seals all wood types, including oily woods

🛡️UV-filtered protection

Description

🛠️ Seal it, protect it, flaunt it — your wood’s new best friend!

PERFECT BASE COAT - Creates a smooth, glossy surface ready for premium varnish finishes
TIME SAVING FORMULA - No sanding between coats means faster project completion
EFFORTLESS APPLICATION - Brush, roll, or spray on for a flawless seal every time
VERSATILE COMPATIBILITY - Works on all woods, including plywood and teak, enhancing natural grain
ULTIMATE WOOD PROTECTION - UV filters protect wood fibers from sun damage and checking

TotalBoat Wood Sealer is a clear, one-part primer that seals and protects all wood types—including oily woods like teak—while preventing cracking and varnish peeling. It dries quickly without sanding between coats and contains UV filters to extend finish longevity. Ideal for interior and exterior use above the waterline, it creates a smooth, glossy base for TotalBoat’s varnishes, ensuring consistently beautiful, durable wood finishes.

Specifications

Item Form	Liquid
Global Trade Identification Number	00811932022400
Manufacturer	Jamestown Distributors
UPC	811932022400
Country of Origin	USA
Item part number	496580
Package Dimensions	17.91 x 15.19 x 11 cm; 998 g
ASIN	B01M0MZ89O

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