Thanks for the info @ECCB - I didn't realize Bus Kote was just elastomeric paint, but with magic beans, err I mean magic beads! Awesome work on the testing, @jazty!
Yeah I don't see any reason to go the Bus Kote route and instead use what I can get here for cheap.

I know not everyone likes elastomeric paint, but for the price, I'll give it a go (AFTER I've made sure the roof is sealed from leaks, of course).
Chris