Occasionally someone asks if they must tape over the fillets, or maybe if they can skip taping just the inside fillets, for example. Don't be tempted to NOT tape over your fillets. Fillets are not just the thickened epoxy - the epoxy filet and the tape together become an incredibly strong component. Fillets will have much reduced strength without the glass tape over them to help spread the loads. If you were to take some scraps of plywood and make two samples, identical fillets except one has the tape, and break them, you'll find that the epoxy fillet is fairly easy to break but the taped one is nearly impossible to break. It's like comparing plywood to solid wood - the composite nature of fir plywood is much stronger than a piece of solid fir the same thickness, in both dimensions! The karate guys never try to break plywood...