That stuff works great for the window regulators, door latch assy's inside the door, door hinges, and things like that. Don't know if I'd put any on the window channels though. Ya might want to use some silicone spray(?) on the window channels. It's clear and won't show when the window is up. Just my $.02.
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LIFE AIN'T EASY WHEN YER FAT AND GREASY!
GMC= Got More Class!

1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started.