My doors were on when I installed the seals. The truck just came out of the body shop after painting, so the surface was uniform and clean. I started at the bottom, in the center of the door and worked my way all the way around.
One tip I got from Olezippi was to not stretch it, especially around the corners. It sticks pretty darn good.
Dan
35 CC Case 38 Chevy Pickup 51 3100 AD 58 3100 Apache Fleetside
