Don,
Lizard skin used microbeads embedded in the paint. Apparently there are two different kinds of beads, so that work better with sound, others that work better with heat. I am thinking that you could get the beads from another source and mix them in your POR15 paint and get both at the same time. And the top coat Keith is talking about is a color coat or whatever. You must paint over POR 15 (if your are going to) within a specified time.
Dan B