At checker auto, they sell a radiator repair kit. In it is a fiberglass patch, some sand paper, a sealer and catylist and a brush. You sand around the leak/hole, then cut a piece of fiberglass patch to size, then mix the sealer and the catylist together, brush it on, and let it harden. it worked good for me.
Also, i think there is a additive you can put in your system that will fix leaks. Not sure of how well it works though.
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