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POR-15 is not necessarily the best option. It really depends on where the rust is. If it is under the exterior paint, do not use POR-15 or anything else like it. The only cure for surface rust under the paint is a quality primer. The rust needs to be removed, either mechanically or chemically, and then sprayed. If it is the pans, look at the POR alternatives. Eastwood sells a good one, and there are several more. I've used POR in the past and had mixed results. It is very prep intensive whereas others are not.
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