If you decide you want to try this, here's a good company I deal with. They have great prices (especially compared to West Marine and Boater's World kind of chains). They carry EVERYTHING too.... tools, glass, even kevlar, for boats, surfboard, and windsurfer building. I didn't buy my resins from them to avoid the Haz Materials shipping charges, but I bought everything else from them including a GOOD RESPIRATOR.... for less than half what Boater's World wanted for it.
http://fiberglasssupply.com/
What materials you ad to the epoxy to make the compound sort of depends on the size of the crack and a few other things. I got a couple books from the library and the used books section of Amazon.com. The main thing to remember is SMALL BATCHES of resin, and pray for some good weather for the cure.
Good luck.