Epoxy on boat

Nothing is forever, but the epoxy is the best thing to use for saltwater.
I like a min of 3 coats and prefer 4.
But the real key to longevity is how long after spraying you can let it cure before water.
 
And remember, auto top coat paints won't last on a boat that's stored in the water.
It's fine if you trailer your boat like I do, and never docking it in the water for more than a few days in a row.
For longer periods you need what's called "bottom paint" made just for boats.

I painted my aluminum boat with epoxy and urethane color top coat and it was much
more durable than I would have ever believed.
I fish around trees and brush a lot and the boat gets scraped by hard branches and such and
the paint would only scuff a little but held tight. It was really quite durable.
I could just polish it out.
 
uv breaks down epoxy eventually, and we all know about the reflectivity of rays on the water. Above water line should get a polyurethane.

One of the easiest to get marine coatings are called Awl Grip. There are distributors all over, even got quarts on amazon https://www.fisheriessupply.com/awlgrip-marine-paint-color-card

We had to do some surveillance parts for a yacht company and they spec'd out that paint. They want you to blast and use their primers, but no question SPI would be a great base that you can leave epoxy underwater and spray around and above the water line.
 
epoxy primer is a must on fiberglass/gelcoat and metal on boats. topcoat with awlgrip, awlcraft or any other single stage polyurethane. as noted by jc, no paint below the waterline on a boat that sits more than a couple few days in the water before hauling it out.
 
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