When applying the fiberglass the the fuse sides I use a 2 1/2 brush and a 2" foam roller. I buy my .6 oz fiberglass cloth in rolls from CST. You can get rolls in 25" widths which are perfect for our use here. The advantage in buying the fiberglass in rolls is that there are no folds to fight and no need to "iron" the cloth. Lay the fuse on it's side, on a stand, as it's helpful to elevate the fuse to allow the cloth to hang while working the resin and balloons....