Diver Guy, what kind of thing are you looking to do on the tear? Exopy encapsulation, sheathing with fiberglass cloth, gluing, putty ? heres a link to some simple tutorials on epoxy used in boatbuilding
http://www.boatbuildercentral.com/help.php
i've made a custom motorcycle fairing, several seats for recumbent bikes, a college mascot head (Go Phoenix!) using epoxy and fiberglass, and built 10', 14', and 16' sailboats that were all epoxy encapsulated and sheathed with glass.
Epoxy is relatively easy to work with, mixtures are pretty straight forward now, usually 2:1, application with brush or roller or putty knife. The key is to plan ahead and then work fast and clean....I get my epoxy from RAKA One caveat, any epoxy used on exterior applications must be protected from UV by paint, varnish, etc..
linky for an epoxy test kit
http://www.boatbuildercentral.com/proddetail.php?prod=E_try