Even with NOS or quality reproduction sheetmetal, there will be a gap somewhere on the car that's too wide despite prodigious alignment efforts. Since epoxy will pop right off, running a bead down the edge of the offending panel with a welder will close the gap right up. Austin prefers setting the gaps at a maximum of 1/4 inch. "The idea is to use a series of spot welds to avoid warping the panel, then filling the rest of the weld in. If you don't, the panel will get too hot and start rolling inward," Austin advises. "Then grind the weld down flat, and repeat the process if necessary. If you get it just right, you won't even need any filler."