I think with the stiffness of epoxy and the difference in the temperature from your car heating it or even melting it, to the coldness of the water might be what makes it come off in flacks, I started using warmer water wax now, and a good base coat is key.
wb and you can find me at crystal and sweetwater and all over wb.
i have a epoxy board and this is what i did when i first bought it.
1. put a coat on.
2 stripped that coat off. after a hour or so of sitting on the board.
3. put down a base coat of sex wax quick humps. (i used the blue label as basecoat for summer and winter)
4. layed down a nice top coat of sex wax quick humps red label. (i did all of this at the begginning of the summer last year.)
5. if the surf is big i sometimes put sticky bumps on top of it all just for the extra stick. (which usually never happens during summer but defiently during winter.)
But you defiently want to use a basecoat every time you go to put new wax on. after you take all of the old wax off.
Rub the board down with a belt sander to give it a rough surface so the wax can grip
Then run it over with your car and patch the dings with a hammer.
Sex wax basecoat. Basecoat is the only quality product they make, use a bunch of it. Make a thick cross hatch pattern wherever you want your wax. Then a bar of Mrs. Palmers. Which btw/imo is the best commercially available surf wax out there. Bumps is ok too. Rub it in circles, uhhh.... Sweet.