Not sure how the non-Malibu windows go in, but since the Malibu qtr window goes INSIDE the body, I'll be doing mine with urethane. Seen several Malibus with window trough/flange rot clearly caused by old butyl, which allows water to get in and eat away at the car....and you don't know until there's a big hole there
Not a fan of butyl tape for anything but holding nuts in a socket for hard to access places.
Not a fan of butyl tape for anything but holding nuts in a socket for hard to access places.