I sprayed the interior after scrubbing and then wiping down with acetone. The product I used was SEM. I used this in 1989 when I did my '62 vette. Still looks good. I used the white to cover the blue grey factory plastic. Then sprayed red. Other wise the color was to deep, almost a maroon. After everything was done I sprayed a satin finish clear coat on it. The seats and door panels were done in Ultra Leather. Great feel and I'm glad I found it.