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I think Rust Oleum is under-rated and that the opposite is true of POR15, which can be ok in specific uses (heavily rusted metal where you're looking more to create a tough shell over the affected metal) but absolutely to be avoided in others (on non-corroded metal, to which it may not consistently adhere). Most hardware stores, Tractor Supply etc sell a hardener catalyst liquid that can be added to R.O. to make it dry faster and be more durable to knocks and abrasions.
Anyplace on the car that needs to have an exterior-grade finish should be done with something more specific, such as direct to metal epoxy- or self-etching-primer, as part of a system where all the products, from bottom to top coats are designed to work with one another. But for some place non-appearance critical (eg, floors) I'd use R.O. any day over POR15. John
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