I don't use any Butuyl primer on the glass, never had a problem getting the glass to adhere and seal to the tape, I only use 3M brand tape/cord
on the front windshield gasket, I use Butuly rubber (3M) when and if I find it, I usually buy the cartrige tube that fits in a cauking gun, if I can't find pure Butuly(getting harder to find in stock), I'll use 3M's arcylic Ureahthane window adhesive in cartrige form, the ureathane sets up fast, so you have to hustle
