I could not find the 99% silicon spray that I wanted so I ended up finding something called Sil-Glyde (part# 765-1351) at the NAPA store. Weather stripping is listed as one of its uses on the back of the tube. It is a silicone grease in a tube I guess. My weather stripping is about 5 years old now and I wanted to keep it from dry-rotting. It took the whole 4 oz. tube to do weather stripping on both sides of my extended cab truck.

I was curious what products other folks use to keep their weather stripping in good shape.