I use Montana so can only comment on it but I know both Montana and Spray.bike are ‘pigment rich’ sprays so I imagine they work very similarly.
‘Pigment rich’ means they have more pigment powder suspended/dissolved in the solvent than your usual rattle can ‘car paint’ type product. You have to be a lot closer with the can than you do with these other paints or the solvent flashes off and it’s dry pigment hitting the frame which doesn’t stick properly and feels rough.
I reckon a lot of people don’t know this so end up using Spray.bike wrong and that’s why it seems so love it or hate it.
They are 3 main ranges of paint from Montana, I prefer the Black range because it’s high pressure, I find the low pressure cans are really bad for this drying before it hits the frame thing. Any time I’ve used them I just end up with a load of coloured dust covering everything in my workshop! Maybe they’re really great for painting walls but bike frames, nah so much. I don’t know how Spray. Bike compared to Montana’s high/low pressure cans.
Montana seems to dry pretty quickly but I think it takes a fair while to really cure and harden up properly. It’s easy to chip it while its in the dry but not hard stage so if you get a bit keen and try build the frame or whatever up too soon, it’s dead easy to make a mess.
I do a zinc primer (anti corrosion as I’m only working with steel) then colour, quite often splatters or some of the Montana ‘Marble’ paint and then at least one coat of Halfords Heavy Duty PU lacquer (which I have found through some fairly extensive experimentation to be the toughest non 2 pack lacquer around).
I try to give each layer 24 hours in decent weather, longer in the cold, to dry than once the lacquer is on I try to give at least a few days before building. I’ll often leave a finished frame out in the workshop for a few days then once the smell has died a bit I’ll bring it into the flat where it’s warmer for a few more days.
It’s never going to be quite as tough as powder but I repair a lot of frames and having been powder coated is a surprisingly common denominator. IMO most powder coaters blast too aggressively and there’s nothing anti corrosive about powder. Some places do it right but most are sadly more interested in doing handrails and sign posts and will rattle your nice steel frame through with the same blasting media and (lack of) attention to detail.