Fiberglassing rust in cab

[jonathan-m]

I had a hole in the same spot as yours and opted to go the fiberglass route. I wire brushed the whole area down and cleaned everything well, then laid down the fiberglass layers carefully and a few days later covered it in POR15. That was almost five years and 20,000 miles ago, and it has held up very well. I check on it every so often to make sure its all good; if you take your time and do it nice and neat then it will do just fine.