I search for that stuff and could only find it in 2 gal for almost 500 dollars
Maybe PRH can throw up a link for a smaller quantity somewares...................
This is what i use.
Is, or was, called Z-SPAR and is now called Splash Zone.
I buy it in a 2 Quart kit for a lot less
https://www.amazon.com/dp/B0032FXM9Q?tag=sa-sym-new-20&linkCode=osi&th=1&psc=1
Amazon has no description so here you go. designed for under water repair for boats.
Key features
- Versatile two-part epoxy for patching, filling and protecting wood, metal, fiberglass
- For above- or below-the-waterline use and can be applied underwater
- Dries to an extremely hard, impact-resistant surface
- Protection against corrosion of metals