From the liitle bit of glassin I have done and the lots of reading I have done, I would say yes, just about all glass'in projects will use atleast some filler... Maybe not tons, but some...Yeah smullen, im going to the junk yard christmas break and getting a headliner from another caprice wagon. Also yes, this is my first attempt to fiberglass so I think it will be a good practice and learning experience. Do you think ill need to use and body filler?