When you worked on the engine bay before primeing it, how did you get the surface ready to paint? And did you fill the big holes in the firewall with metal or just filler? Thank you
I filled all the big holes with steel sheet metal I bought from my local metal shop. I welded in the patches and then cleaned up with a grinder. The biggest job was closing off the heater motor hole. I basically welded a plate on the back of the firewall and then used a very big holesaw to cutout a plate to fill the hole in the bay. Once everything was welded in, I smoothed with my grinder and then filled with Rage Gold body filler to smooth. I stripped the entire engine bay with my DA sander and used the needlegun for the hard to reach areas. For the final surface prep I used Kustom Shop grease and wax remover from TCP global and then shot etching primer, then urethane primer for the whole car. Hope this helps.