Good tools to do the job right are a must.
I would start a collection of Perma-grit tools.http://www.permagrit.com/
They will not dull when working with fiberglass.
Then a good rotory tool like the Dremil Stylus.
The best tool I own for modeling.http://www.dremel.com/en-us/tools/Pages ... x?pid=1100
I can't say enough good things about it.
Get some good carbide burrs too.
Fiberglass is death to all tools not made from carbide. BD.