These photos show some of the fiberglass used to make the patch. The first step was to put duct tape over the outside of the hull. Masking tape would work well. I wanted the temporary patch to be somewhat rigid. Paint a coat of gel on the inside of the hull (onto the duct tape). Then use many small pieces of 1.5" fiberglass was added the the hole. Don't worry about how it looks. The fiberglass will be bumpy. Keep adding pieces to fill in the full cut out area and an inch or two over the surrounding hull. Chop matt would work better then tape, but I find it hard to work with and we have lots of tape.

The inside needs a few layers of fiberglass. The first layers were added to fill in the hole. Starting with small pices of fiberglass tape inside the hole. Then use larger pices to cover the full taped out area. Once this is dried, sand it to be almost flat.

Once the inside dries, and it and add a layer of gel coat. It does not need to be neat (as in the photo), but the neater it is the less sanding you will need to do. Sanding is the time consuming part of the job, so work need and sand less. After the gel is painted on I use a squeegee to smooth it over and get it to a decent thickness (bottom photo).