I put an nos skin on my Cuda door. Take your time to fit it right. I mounted the inner part back on the car with skin tacked in a few places to make sure it's square to car(quarter and fender). I used a large flat chunk of aluminum on the face side while bending the lip over, bend over gradually along the length making about four or more passes. Think like you're bending all at once. You don't want to stretch the metal lip. Continuely checking fitment to car. Do not hammer on face side. Mine came out perfect with No skim coat needed( I hate skim coats).