We then sprayed the core support, inner wheelhouses, and firewall with the low-gloss underhood paint (PN 14147 Z). For the frame, we used their satin black Chassis Black two-part paint (PN 14145 Z). We did find that we needed to use a lot more of the black paint to cover the light gray primer. So if you want to save a few bucks, skip it and go directly to paint. In our case, we used nearly three cans of the low-gloss underhood paint and two cans of the Chassis Black.