I am replacing the top material on my fordor and am wondering on how and when I should cut the top vinyl material. I am using the aluminum molding. Should I cut the vinyl after tacking it and before placing the molding, or after I put on the molding and then use the molding as a guide to cut the vinyl? I would assume that if I do the latter, sealing the edge of the vinyl is essential. Thanks for the feedback. BTW I have looked at Marco's great tutorial, but am still a bit confused on this one part.