Tight panel gaps distinguish pro bodywork from hack jobs. Cameron suggests using a nickel to help gauge panel gaps, and fills them in with metal and filler rod as opposed to body filler. The door-to-quarter-panel gap is notoriously large whenever using replacement quarters. In bare metal, Cameron shoots for a 3/16-inch gap, which provide clearance for paint and primer. Once the panels have been painted, the gap closes up even more.