I have a PT-40 that is covered with Koverall and painted with Brodak dopes. If there is a weight penalty, it is very slight. Being a trainer, it has had its share of training accidents but it has held together where I am certain that the plastic coverings would have failed.

I have a GP Extra 300S that is covered with Stits poly-fiberand painted with the recommended Stits paints (poly-brush, poly-spray, and poly-lite colors). I really do have to say that it is a very nice, well coordinated system. Again, if there is a weightpenalty, it isalmost negligible. The finish has come out great.

Both are nitro powered. Neither have had any of the finish rub off on the cleaning rag.