jas use the west system guide for this its perfect for what you want. if you want some help doing it i can come down and help ya.
yes you have the basic idea, grind it out to a 12 to one taper then fill in layers with glass, fill then smooth and paint
edit if you have access to the inside you can also do the repair from the inside to have less to paint, but then the water pressure is pushing the patch in, not onto the whole. the best is do a couple of layers inside and more out side to form a sandwich
Last edited by scottyt; 03-01-2009 at 04:20 PM.