Now comes the fun and slightly nerve-racking part: actually working the Roller back and forth. We say nerve-racking because the pressure from the Roller will naturally flex out the sheetmetal a bit as you work—so make sure you keep the paint warm. It’s even better if you can recruit a buddy to keep the paint warm while you form. Most cars don’t have perfectly round wheelwells, so expect to work a section at a time (4-6 inches at most) and readjust the Roller as needed. The pressure adjustment bolt can be turned to apply gentle pressure to form the lip a little at a time. Patience pays here to save paint and sheetmetal damage; don’t get greedy.