I have used POR-15 numerous times. It does dry super hard. 80 grit paper on a orbital will barely take it off. The top coats are mostly for UV protection. They have a newer product called hardnose topcoat. I have only done a couple minutes worth of reading on it, but it might be something to look at.
I painted my dads car trailer about 6-7 years ago with POR, and didn't ever get around to top coating it. It sits outside in the sun year round. The POR will turn flat black, but that is about it.
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Sold everything but one.
1211-snow pusher, cab ,54 inch plow, loaded tires (all 4) Gilson wheel weights, X-trac fronts- soon to have power steering and dual hydraulics
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