I replaced all the weatherstripping on my 1980, using the $200 stuff not the $500 stuff, and was prepared to wait weeks or months while the windows learned to fit just right. The other day I was in the NAPA auto parts store and saw a NAPA product called Sil-Glyde Lubricating Compound. It is their part number 765-1351.

Before putting the Sil-Glyde on the weatherstripping, the windows would not seal just right because they would not go up that last little bit. I have power windows. I would describe it the same as I have seen others describe it, the fit was just too tight. I put the compound on, a little to liberally, and the result was instant closure and a perfect seal. Took her out on the freeway and no wind noise at all.

Best part of the story is the 4 ounce tube was $3.99. GM has a product called Silicone Emulsion that does and is the same thing for the same price. I have not tried that product but I have read other posts that recommeneded it also. I am not sure if these products "soften" the weatherstripping. What these products do is eliminates friction between two different materials.

Hope this helps others as much as it helped me.

 

Nice find, I have a NAPA in town. and the closest Gm parts dealer is 40 miles away. Do you know what i'm going to buy tomorrow....Thanks :seeya