When I had my Challenger i installed the glass myself (first time ever to be honest) i got the 3m Butyl tape at Napa in the correct thickness, m frame was freshly painted and I installed it with the install blocks and a suction cup. push it down good and it never leaked and the trim just snapped back down and was snug.

the A-bodies though, they are another story. messy messy with that gasket