I just got through doing two Colt SP1's with Colt grey and flat black. Worked well, there will will be some runs. You can give it a wipe and recoat or let it dry overnight. sand the spot and recoat. The stuff lasts in the can long enough to recoat next day.
They sell a degreaser, but non chlorinated Brakleen works too. Be sure to hit areas like the ejection port door latch with a Heat gun or blow dryer to get all the oil and degreaser out of there. It will mess up the paint job.
I would also buy direct from the manufacturer Lauer Custom as they offer this spay in alot more colors to choose from.
I reassembled two weeks after coating and it gets full hardness in 4 to 6 weeks. Seemed fine after two weeks.
So bottom line is this stuff is pretty easy to work with and fine for the rifles I did with it. But if I was doing a handgun that would be in and out of a holster alot, I would probably send it to a Cerakote applicator .