I agree that prep is important but I don't know how prep can help the area where the dash requires the windlace inside lip to fold back against itself. In my case atleast the track on the cab for the windlace was tight to the dash so the inner lip needed to be forced forward to allow the shape of the windlace to move in the track. As a result I could only get the windlace to move 1/4" or so at a timeonce the bottom end got to the dash area.
