3 HOURS BETWEEN COATS?!?!?! Holy smokes!! That's crazy talk! Last primer coat I did was 5-10 minutes between coats. 15-20 for epoxy!
Looks like the cups you are using are the PPS 2 series. Probably a 3M deal only. The PPS 1 series seems to be copied by everyone and are easy to get cups and lids. I just got another kit of 650 ml cups and added an 850 ml kit as I had some decent size panels to spray on my Suburban.
I have reused liners and lids before. But the real beauty is having enough cups, liners, lids and locking collars to mix up a few cups worth, depending on needs, and spraying one, then, when used up, popping another mixed cup on the gun and continuing where you left off right. Then, when done coating stuff, just throw away the liner and lid, clean your gun and watch the paint dry.
Best thing you did was read what the manufacture recommended for the paint you are using. That puts you miles ahead of most people. Have a place to test your spray pattern, piece of cardboard, etc, before you actually apply it to the frame. Hit all the hard to reach places first. Be aware of your hose and body parts so you don't rub the area where you just laid down that nice coat of paint. Don't worry about mistakes, they can all be fixed.
If things start getting weird on you, stop. Figure out why. Is the gun sputtering because the air compressor not keeping up? Is all my compressor moisture trapped or am I spraying water with the product causing immediate fish eyes?
Having some degreaser or wax remover around will be helpful for when that freshly sandblasted frame is manhandled with bare hands. As they say, prep is everything! Oh yeah, make sure you have a proper mask and it seals to your face well. You only have one set of lungs. I'm sure I can think of a ton of other things, but lunch break is over and I gotta get back to work.
