I just got done putting on Glassworks Fiberglass fenders, all 4 on my 1987 Toyota PU. They fit real nice but they are a pain in the a@& to put on. The question I have is, does anybody have any idea of what I can put on the inside of the fenders? There is a lot of open space in there and I am worried that while driving in snow or mud it is going to get packed on the inside of the fender. Any Ideas? Let us know. Thanks JMach1