My coupe body is from N&N, flat flange with a finished edge on the outside of the back glass opening. I had a "glass guy" come out and install the windshield and back glass. He used the heavy, thick black mastic to glue them in from the inside (back), and smoothed the bead between glass & body like working caulk. The "bead" on the back glass is maybe 1/8" thick, smooth black line. Front glass glued to the outside and the mastic is thicker, almost 1/4". I have a SS trip piece on the front that's attacked with 3M trim tape.