hope this site helps, but repairing fiberglass is very easy, if u got just small cracks u can fill in with fiberglass filler but if you have cracks through panels u will need to repair it with backing patch. http://www.fiberglass-repair.com/
I repaired Corvettes for many years. All cracks must be repaired properly. A crack is a crack and it will come back if not done right. Here is a site that offers videos and books as well as the best materials. http://www.fibreglast.com/
Do not use the cheap rosin sold at the local parts store. Use a good epoxy rosin.