Hi guys, have been a member for awhile but my first post needing advice. I recently acquired a project car (1966 mustang Eleanor) the previous owner sprayed evercoat 4 to 1 high build primer on the fiberglass parts but didn’t use epoxy under the high build. My question is can I spray epoxy over the primer and then a couple of coats of SPI primer so I can wet sand? Also what grit should I sand the high build before applying the epoxy?