I'm amazed that you think that you can deviate from what spraygun and paint manufacturers have spent huge amounts of money and time developing just to reduce the size of the compressor. Don't you think that if it were that easy, all of the bodyshops across the world would have worked it out? Trust me, when it comes to saving money, back street bodyshops have already tried it!Rattle cans are thinned paint. It should look a bit like those. Although I am relying on imagination just now.