Howdy Miss AJ,
Personally I use "off the shelf" spray paints regularly, very rarely do I "break-out" any of my five airbrushes to spray a model unless its for use with Alcad paint or if I want a special finish like a camo scheme.
I am sure by now, you have probably seen one or two of my models. Well each one of them with the exception of ones months ago, were all painted with off the shelf spray paint from wal-mart. Alot of times, the paint i have used on some of these models is the cheapest spray paint that wal mart sells...their own brand. Now all the details I do with a brush and testors bottled paints.
But, I am happy with the finishes I end up with.
One word of advise is to take your time masking off the areas you dont want to recieve paint. You can use cellophane tape, masking tape (paper type), or a combonation of tape and newprint cut to shape.
Always allow the previous coat of paint to dry before applying a different color or before attempting to mask over a previously painted area. I sometimes "cheat' at this, but I have been doing it for many, many, many....you get the idea, Years.
If you use cellophane tape or any tape with a really sticky adhesive, first, tear off a piece the size you need and "stick it" to your pant leg or shirt, rip it off the clothing and do it again, maybe even a third time. What this does is removes some of the 'tackiness" of the adhesive, that way when you apply the tape, paint underneath the tape wont come off when the tape is removed.
Nothing is worse than ruining a paint job by peeling off tape only to discover that the paint under the tape came off with it.
I hope I have been of some help to you, if you want to see the results spray paint can achieve, feel free to click on my gallery and look around.
Have a good day,
Greg aka GEEDUBBYA (GW)