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What you are seeing is either condensation or the propellant itself in liquid form coming out of the brush. If it is the propellant, it is either the can is not upright, or you have your can elevated above the level you are spraying. I had this happen to me on more than one occasion in my days of building plastic model cars, I would have the can sitting on the shelf above my workbench and the work area was below it. Sounds weird, but weird stuff can and will happen. I agree with everyone here, get a compressor. It will save many headaches in the future, including the one ya get from breathing in propellant that seeps out of a can that has an improperly mounted or bad fitting on the hose. Oh, I should add, if ya stay with the canned gas, put the can in a bowel of warm (NOT HOT!!!!!) water while ya use it. Fill the bowel til it has enough water to cover the bottom 1/4 of the can. This actually helps cut down on condensation build up and will prevent frost from forming on the outside of the can.
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