The temp resistance is pretty decent on JB. Are you planning on recoating them or wrapping them? I think the ceramic coating process has a very high temp cure. I'm not sure as to the conductivity of JB for electrostatic powder coating. I'd be tempted to fill pits and dents with some welding wire and then grind/sand/polish down to a coat-able service.
If your just going to use a rattle can High temp paint over the JB, It's a simple inexpensive fix and should look good with a few light coats. Just a few thoughts, before you get deeper into it.
2012 Highball w/ Power Commander and RPW Big Slash.
2006 Buell Firebolt XB12R Raced mapped/Gutted Exhaust.