It's like seam sealer, but is used for window installation. You put it in the groove of the gasket that clings to the body and also at the bottom channel where there is no lip on some vehicles. I've seen people use it in the groove that holds the glass also, but have seen it ooze out of that groove in the hot sun later. It never hardens. I have a 30 year old partial tube in the basement that isn't hard. I used it to seal around the butyl strip of the windshield in my 71 Challenger conv. in 1993!
