tooling-gel coat ate through the clear paint and primer underneath so my question is which paint can I use that won't be eaten by-tooling-Gelcoat? help

It makes me think that Mr. Gromis used was or PVA or a combination of both as release agent  before using the mould, same as I tried
That wax wax then attacked by the polyester gelcoat.
I mentioned that I had the same problem a year ago
and used 2k epoxy primer in a hurry to get the part finished - yes I forgot the epoxy hardener when spraying the epoxy primer by mixing it up with two different canisters of the same thinner :-(

I spotted the mistake straight away when applying the  chemical release agent which simply stripped the part of the primer which was due to the missing hardener just being an air drying primer.
Once spotted I waxed 10 coats over it hoping to get away, did the infusion and voilia, the part stuck causing even more troubles

I hope that my gone wrong helps
My Lesson learned - stay away from wax, PVA can be used if a must and surface does not matter