[1crosscut]

Okay here is another option for you. Some might scoff at it but it really works and is long lasting.

Clean the area up and then cut a patch to fit over the area out of cotton cloth.
Think T-shirt type of material.
Rub silicone caulk into the patch saturating it completely.
Place the patch over the problem area and smooth it flat. Resist the urge to plaster a layer of silicone over the top of the patch. It doesn't need to be thick.

I've used this method to patch many, many things over the years and it works really well. The radiator on my AA truck has one of these patches and it's still going strong 12 years later.