2007 Bandit

it is fairly common for people to use Single Stage Urethanes on Engine blocks.

Which would probably be the route I would go.
Simply because with all the heat, and chip resistance you need. you want as little material on there as possible.

I would probably go a coat or two of epoxy based Sealer. And Single stage right over that.

Several years ago I painted the calipers on my bike and they held up great. I eventually sold it but am sure they are still good.

I painted them with base/clear and probably used epoxy as a primer/sealer.

single stage works good, base clear is fine as well. i have used both on bikes and cars. everyone here is on the right track. a sealer coat of epoxy first then base. i sell alot of small amounts of base to a local car customizing shop who probably does 1-6 set of car calipers a week. thats how i told those guys to do them and they all hold up great.

if i rememeber right, that formula has a ton of clear in it and doesn’t cover well in even the premium paint lines. i would say on that formula the undercoat color will definately have an effect on final color of the paint. i would make sure the base color is a nice solid very light grey or white. wouldn’t hurt to use a sealer under it.