We adjusted the arm to center the Delrin roller on the lip. Then, we positioned the roller so it will push up on the lip to create the initial bend. At this point, Eastwood recommends heating the paint with a heat gun to make it pliable and prevent it from cracking. We didn't have a heat gun handy, but the sun was doing a fine job warming the paint since the temperature was in the triple digits that day. We got lucky having the sun on our side, but we wouldn't recommend taking that chance. Get a heat gun before you start.