If you are refinishing a automobile and will be working with fiberglass read the directions on the can of resin do not proceed with out doing so. When working with fiberglass tape your sleeves shut, keep your collar on your shirt buttoned tight, keep your shirt tucked in. This is so the dust does not get everywhere. When done take a cold shower to rinse off so that your pores do not open up causing you a big itch fest.
P.S. this works when you are insulating your home with fiberglass insulation.