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Re: rust issue
Imho POR-15 is best used for areas that are not exposed to moisture, like interior and trunk floors.
Door bottoms are very susceptible to moisture accumulation, which explains the rust damage on your door.
When POR is used to cover rust damage on a door, there is a good chance that moisture can work its way between the POR-15 and the underlying metal, thus accelerating the rust, where you cannot see it.
Eventually, the POR-15 material may come off because the underlying metal has rusted away, leaving a big hole.
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