What butyl tape thickness works best for quarter windows and back window? i would think the thickness of the butyl tape would affect the back window trim and how easy it goes on and if it seals against the glass. What do any of you guys recommend? i have 5/16 thickness that i could use on the back or both quarter windows, but i would need to buy another roll to do all windows. not sure if i should get a 3/8... :-k What works best?