Jordan,
I don't have any experience with POR15 .....and don't think they have spray cans (?), but maybe this is an alternative.....I used Rustoleum rusty metal primer inside a hollow crossmember, with help of a small nozzle and thin hose.
The nozzle and hose came with a can of (Valvoline) bodysafe protective coat for sills and other hollow areas. While I am not a fan of this stuff and don't use it on the Chev, I did like the hose and nozzle.
I had to search my collection of spray can caps for a suitable one that would allow the hose to slide over the end....and fit the top of the Rustoleum can.
I sprayed a quick thin coat every evening of the week and cleaned the nozzle and hose afterwards by fitting the hose to a second cap that would fit a spray can of brake cleaner. A quick clean with brake cleaner and the hose and nozzle were ready to be used again.
Alex
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Chevrolet C8 cab 11 FFW
BSA Folding Bicycle
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