Trunk paint

After a little search, I wasn't finding what I was looking for. Anyone done splatter paint in their trunk?

My Dart has some surface rust in the trunk I'd like to stop from advancing. My thought is to wire-wheel the rusty areas, clean and prep and put down some POR 15, then put some Zolatone-type splatter-paint down and forget it. I realize it's not 'factory correct' since Darts are body color in the trunk, but this is what I'm leaning towards.

Anyone done the same thing or similar? Any arguments to the contrary I should know about? Painting over Por 15 OK?
Thanks,

Greg