I'll be "that guy" and toss in some unsolicited opinions...
1. If you ever think you want to paint the rig with automotive paint, just remember you'll have to remove that layer of rattlecan paint.
2. By the time you buy enough cans to do the rig you are pretty close to the price of entry level automotive paint. A cheap HF spray gun and inexpensive paint will look (and last) better than spray paint.
Just a little food for thought...