I used SEM brand on my 78Z and it came out bee-yoo-tee-full...painted all interior panels including the small panels under the dash & the console...original color was black...I used "Palomino", a fawn/light tan color...used 3/4 coats...covered perfectly and no runs or sags...I too suggest the primer and clean the panels several times...somebody may have used Armorall or similar stuff in the past...these will prevent good paint adhesion!!!...Good Luck... )