I recently purchased a 13' river hawk duck boat model (has a false floor and no center box). It has a crack about 4-6 in long along the keel on the underside towards the front of the boat. The crack is pretty deep so I want to cut the fiberglass out and repair. I have done this once before with another boat, so I know how to work with the fiberglass. I know you are suppose to patch the inside and out for the most strength. However, I don't know how to do this without cutting through the false floor and don't really want to do that. If I lay enough layers of cloth on the outside portion of repair will that hold? Also, is epoxy resin better to use than polyester? I plan on applying gator glide to the underside once all the repairs are made. Thanks in advance for the help.