i was thinking about going with fiberglass front fenders for my 66, it is going to be a steet/strip car ,anyone with opinions or experiences?

Theres my experience when working with glass parts. First things first, when you first recieve the parts put them in a safe place and let them air out for about two weeks. If you dont let them air out you run the risk of traping the gases that come out of the glass after its been molded. Preferable use an area that is heated, its best to put them out in the sun. The heat will work out any bubbles in the glass resin and so tighten up the glass fibers. This highly affects the panels fit and gives the glass kind of a memory. And if you dont air them out or cure them before you paint them the sun will cure them and change the fit after you have painted them, especially if the car is painted black.

After the panel has been cured its time to fit and adjust it. If need be trim the panel with a grinder disc. Once the panel fits you need to wash the the entire part with a wax and grease remover to remove the release agent. Now sand the part starting out with 80 grit paper or 180 or even 220 depending on the quality of the gelcoat.

The gelcoat will act as a guide coat to help you find any low spots that will need body filler. DONT REMOVE the gelcoat as this will open up the pores in the glass and will cause paint problems later down the road. Also dont wet sand the gelcoat as the glass is porous.

If you do sand through the gelcoat apply a skim coat of glazing putty or light coats of urethane primer. Dont pile on the primer to fill the pinholes in the glass, a heavy coat of primer wont flow into the hole just bridge over the hole.

When time comes for primer dont use an self etching primer, use urethane or even an expoy primer for the first coat of primer.