painting small pieces is fine. i do that often to paint lips and stuff.
not sure how well rattle cans can withstand the long spray duration on large panels as pressure inside the can drops as you spray. that is the limiting factor for using rattle cans... the fan nozzles are usually pretty decent.
one reason why when i paint wheels, i use 3-4 rattle cans simultaneously (not in both hands lol) and spray layers from each can taking turns before pressure drops. and keep the cans in the sun, warm to the touch.
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