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Re: Fiberglassing rust in cab
If you're not talking big holes, you can use POR-15 and fiberglass cloth to seal and patch it up. Start by taking a wire brush and getting all of the lose stuff off. Clean with some wax/grease remover. Then brush on some POR-15 and while wet, put down some pieces of fiberglass cloth. Then brush more POR-15 to soak all of the cloth. Do 3-4 layers of this and then let it dry for 48 hours. Make sure while you are doing all of these layers, you keep everything wet. At this point it will be rock hard and sealed up.
Again, holes smaller then a dime size and not a bunch over a large area but looking at your second picture, that should likely be fine.
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