flathead 53
Well-known member
What was the original from the factory underside painted, car is original never any metal work done ,no under coating, trying to find what color underside should be.
Most of the time it was red oxide primer. The factory did not tape up at the rockers, so the under floor area will be over spray of whatever body color they were painted. Some of the plants in later years used what they called slop paint. It was all the left-over colors mixed together. If that is what you have, difficult to reproduce that.
You should be ok going with red oxide.