Admin...Yes, I have sprayed the paint from the can to a glass jar quite a few times (as was done here with the yellow, orange and red). The only reason I have done this is because the paint is only available in spray cans, and after using probably 50 cans of it, I know the paint very well. The thought of screwing up a paint job with a paint I am unfamiliar with makes it hard to deviate from something I feel comfortable with.
After spraying into the glass jar, it has to sit for awhile for the bubbles to dissipate. I can then thin it with laquer thinner and start spraying. I could also just go ahead and spray it with the can, but the airbrush atomizes it alot better for a faded paint job (one color to the next).
This boat is fiberglass, and was white gelcoat when I started. I paint clear lexan bodies for RC cars as well, but that is ploycarbonate paint to resist chipping when the body flexes. Luckily, that paint comes ready to pour!
Anyway, just follow directions; sand primer with appropriate grit paper, re-coat within the suggested time frame, let cure as suggested, etc. Also, spray the areas not easily seen first, then the parts that will really show. This will help avoid getting overspray on the parts that stand out while trying to spray the hidden areas. In other words, if you are going to paint the grill and front axle, paint the axle first, then finish up with a good coat on the grill. It's better to get overspray on the axle from spraying the grill, rather than the other way around.
Another suggestion is if you are going to spray it in your shed or garage, it might help to mist the floor with a water hose before painting to avoid dust being kicked up.
Only other thing I can think of is the obvious- wear a respirator!
As for a decent paint that is pretty durable, I have had good luck with Dupli-Color. You can find it at Wally World.
Good luck,
Greg