I've been decanting paint from spray cans for many years simply by warming up the can in warm water, shaking it and spraying on model car bodies and parts. This method works great for me, as I get really nice finishes with metallics, candies, solids, clears, etc. Even works great when painting two and three tone paint jobs as well. No mess, no fuss, no adjustments, no water traps, no noisy compressor, no air pressure or needle problems, etc.