I'm not so happy about the epoxy compatible gelcoat GV50
When mixing with 5 to 10% the gelcoat looks matt, even so it is too thick to be sprayed in a standard 2.5mm gravity fed spray gun and then it is polyester mix, something I really distaste.
additionally, I can't overcoat it  no matter what waiting time, running into danger that it either blisteres or does not adhere to the first coat.

Don’t laugh but I’m a fan of How-Do-they-do-it, watching it all the time just to see what is around and getting ideas what to try in my field
I'vebeen watching people using gravity spray guns coating the mould in paint/gelcoat, most likely 2k and then adding the fabric for either pre-prep curing or infusion without any problems.

Has anyone any idea what they use. As far as I’m aware, Epoxy has very good adhesion to near anything at superb strength except “poly’s”

Thanks in advanced, that will be used in none permanent water submersed marine equipment

thanks for your feedback, Hanaldo
You confirm what I was thinking to do too