The only reason I ask, is that this is the answer I usually get - too much overspray when trying to get hidden angles, often having to touch up with hand painting anyway, etc.

A lot of the time, its from either not being patient enough (I see this in younger painters all the time), or not being at the right angle/distance from your models.

If you use the spray can at a perpendicular angle to the horizon, at 12-15" from your model, and spray in short bursts ~1-2 seconds at at time, you will get amazing coverage, in thin layers, that dries quickly and doesn't obscure detail. Spray a few minis, let dry 10 minutes, rotate the minis 45-90 degrees, spray again, let dry 10 minutes, etc. Takes about an hour to get 10-15 minis sprayed in this way, but the coverage is impeccable, the matte surface emphasizes the details rather than obscures them, and if you spray in these short bursts you can spray into the hidden angles that might have been missed without any fear of over coverage.

If you like hand priming, by all means continue and enjoy - but if you fancy trying to spray prime again, I think you'll find the time it saves is well worth it when done properly. I typically will spray a base coat on several "rotations" of minis at once, so that when I'm done with the last "rotation" the first set is dry and ready for a second spray. In this way, I've been able to prime close to entire armies in an hour or two.

No right or wrong way to prime - spray vs hand painting is always going to come down to whichever is most comfortable for each painter, but if you want to give it another shot - or if there are other readers who want to give it a shot - some of this advice might help.