LOL. Ya I glassed the inside up first. Then i came back to the outside and back filled it with glass. Its not a good idea just to fill it with body filler. The filler could crack. You don't have to back fill it totally but close. Filler will do the rest.
So do you lay glass over the edges on the inside but cut the glass to the exact dimension on the outside? The little bit of fiberglass that I have played with 15 years ago was not pretty and I can't understand how you guys make it look so smooth.
Well you can do it two ways. You can wet it out before you apply it to your work area or you can wet it out on the part itself. Usually depends on if it is in a area that you can work. Tough area maybe wet it out prior.
Beveling can be done with any type of sanding tool. Just helps the glass to lay in nice and helps to provide surface for the new glass to adhere to.