You can get a fiberglass repair kit at Walmart for ~ $10. Read the instrutctions.
Sand down the spot to be repaired. If you are "patching" a hole you may want to use something as "backing" [paper ??] that you can remove after the fiberglass is installed. You don't have to be real concerned how the repair looks......just sand it down when finished and it will look good. Don't breath the dust while sanding....it is bad for your lungs.
Cut the cloth to the size you need and then mix up a small batch of resin. It will harden in ~ 2 minutes so you don't have a lot of time to get it put on. The resin can be applied to the boat and then cover the area with the cloth and then apply the rest of the resin that you mixed up. Two or 3 layer of cloth should be enough to make the repair. Add just some resin for the final layer to kind of smooth out the repair.
Or you can dip the cloth into the resin and then put it on the spot you are repairing. If your repair spot is small and "easy" to cover with the cloth....you might be able to apply 2 layer of cloth with each batch of resin that you mix.
Let the first layer dry and repeat until it looks to be the right thickness. You may have to apply a layer on both sides [inside and outside] to get it repaired and look better.
It can be painted after you get it all sanded to look good.
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