So, can anyone explain why my '68 had red primer on the underbody instead of gray? I find this fascinating. When I stripped the crud and undercoating off the floorpans I found a red, not gray, coating, then what I assume was a black sealer on the bare metal. I know it was this way because I stripped the car myself, layer by painstaking layer with solvent, Scotchbrite and a putty knife. I'm not doubting anyone--you guys know way more than me--please don't misunderstand. But the posts imply that red primer was never used at all. Was my car built on a Monday with a hangover?