Thread: Submersible finish required

2 pack marine "varnish" or tinted finish. You'll need to visit a ship's chandler or marine supplier

oh, and if you need impact resistance, you'll need to fibreglass the "contraption".
Seek additional advice, but I would think that 6oz cloth (6 ounces per sq yard) would be heavy enough.

I don’t think you can go past marine epoxy - just the epoxy, not epoxy and glass cloth unless you want a sheathing. It will yellow, everything does, but if you choose a ‘non-yellowing’ formula it will be tolerable. Your other 3 boxes it ticks quite nicely.

Cheers
Arron

Cheers boys, I think i'll go with the marine epoxy, and just make it a thin coat. i'll post pics when finished.

I should have pointed out that marine epoxy is generally not self leveling, so the strategy is apply the epoxy, sand it smooth, then apply a marine varnish. The epoxy is needed because the marine varnish isn’t particularly waterproof, no varnish is. The varnish is needed because sanding the epoxy leaves a cloudy finish, varnish it and it goes back to being a smooth transparent surface - like magic.

It doesn’t have to be done this way, it depends on how important aesthetics are and whether you want a smooth finish or not. You can just use the epoxy, but it will be a bit lumpy, not slick like a racing yacht.

Originally Posted by Fumbler

Cheers boys, I think i'll go with the marine epoxy, and just make it a thin coat. i'll post pics when finished.

don't make it too thin or it won't be waterproof.

It's many many years since I used a two-pack marine finish, but my recollection is that the finish was self-leveling.
examples:
https://www.whitworths.com.au/pnt-uc-perfect-1l
https://www.whitworths.com.au/pnt-p-top-white
I'll leave you to explore further

I might actually pop out and see a mate who makes surfboards and see what he suggests. will let you all know how I go.