As I get older, I find I have less tolerance for cans of spray paint that don't. I have always religiously followed the instructions to shake the can for at least a minute after you hear the ball start to rattle and then invert the can to spray out the pick up tube when you are finished painting. I also used to clean out the nozzles with fine wire. I used to soak the nozzles in a jar of lacquer thinner. I used to stick the nozzles on a can of brake cleaner to blow them out. These days there are more nozzle sizes/configurations on the paint cans and cleaner cans that this method is no longer practical. One method I have found that works is to shoot the offending can with a .22. Then they spray real nice.
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