The biggest over lap i had was bout 3" or so on the pass floor. Some of it i trimmed out from underneath after the patch was in. Ive got some urethane similar to what they use on windshields that im gonna seal all my seams under the car an put a few good coats of undercoating. That should seal it up pretty good. Now i know why body shops charge so much! I overlapped the body patches too. I made the body patches look a little rough on purpose cuz that was the look i am goin for. Most of the patches on the car are stainless too! So i dont have to worry bout them rusting. Thanks for lookin out though! I almost just covered the rust up, it would of been way easier but it was worth the extra effort to do it right!