it doesn't matter. just put a layer of resin over top and you can use what ever you like. I used water based test pots for one of my repaints
If you put layer of epoxy resin on top then your board will yellow real quick. Maybe polyester resin might do ok on the top. Epoxy based resin.needs to have a protective top coat like a clear marine varnish or even an automotive clear coat.
I built a light wind board from plywood laminates and put 3 coats of marine paint on it, thinned the first coat. Works the very best, still going. I can't remember what I paid, maybe 15bucks for a quart, got it at the local hardware store.
It's bright orange... can't miss it
so, did you still put a clear coat on it? Did you put any wax on it?
any pointers you could offer as to prepping , or technique?
Got any photos of the board?
I've been looking around , but I haven't found any good tutorials on how to paint a board so it will last in the salt water. I might look in some boating forums.