Fixing a Mustang's window has me torn on using adhesive primer
So last week, I was putting in a new side window on a '67 Mustang. My buddy who helps out said we should skip the adhesive primer because the new urethane bonds fine without it. I mean, I've always used primer, thinking it helps the seal last longer, especially with temperature changes. But he pointed out that it adds time and cost, and maybe it's just me but I've seen old jobs where the glass popped out after a few years without primer. Idk, maybe the materials have gotten better. On one hand, saving time and money sounds good, but on the other, I worry about the glass coming loose down the road. What do you all think? Is primer still a must for auto glass, or are we stuck in our ways?