I bought one of those rechargeable spray cans from J.C. Whitney years ago. You put the mixed paint in it and charged it with an air compressor. Wasn't worth a dime for painting, it doesn't lay down a very smooth paint job, has spits and splats as you go. The only plus I got from it was it came with an 18" long accessory tube and 4 way spray head that I would attach to regular spray can rust preventive primer and spray inside panels with it..... save your money.
Best thing I've found for painting small items and trimming is a small spray trim gun. You can buy one at HF for about 20 bucks or so....
John
