Krylon is a very cheap paint. If you paint over any other paint, be ready for a "crackle" finish, whether you wanted one or not. I have one piece of equipment painted in it, and let's just say "Never Again". I'm wet sanding it off this coming weekend.
If you want a paint that's cheap and fairly good for various projects, try Orchard Supply $1.99@ can stuff. I've used it for years and it holds up well. I use it on R/C sailplanes which I have to wipe down from time to time with solvent to remove poison oak, and the paint seems to take the abuse. They have lot's of low-visibility colors too.
If you want to spend more, Rustoleum Appliance Epoxy gives a surprisingly hard, glossy finish, though it takes a week or so to really kick in cold temperatures. A warm, low humidity environment makes it really work.
I'd spend the extra money and use a real "kote" of some kind.