Water based paint and acetone acrylic cannot come in contact with each other. You will need to run toluene through the machine to ensure the unit is completely filers of all water residue. Once you wish to switch back, clean out the unit with toluene again, clear all the toluene out, then run water through the pump to ensure all toluene removed. You can then switch back to your water based paint. Real pain. We have switched over all of our projects to the acetone acrylic. It is low VOC compliant and dries super fast. Very little dirt pick-up as well. No clogging and a lot more durable than the water based acrylics.
Hope the info helps.
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