|Forum topic by JonHitThingWithRock||posted 09-08-2013 08:48 AM||837 views||0 times favorited||11 replies|
09-08-2013 08:48 AM
So I’ve been spraying “water-based poly” for a couple projects now, I was using a $15 harbor freight gun and it was ok, I would spray a coat, then take the gun apart and drop all the pieces in a bucket of water (the can said water clean-up), then i’d brush-clean with water either immediately or after a couple hours. i didn’t have any need to spray for about a month and yesterday i filled it up and started spraying. The trigger squeeze was very stiff, and i had to manually reverse the trigger to get it to stop firing. I got through the coat and took it apart, and everything was rusty inside. In my head this meant that water was no good for gleaning spray guns.
I then got on the interwebs and looked up some videos on the facetubes about gun cleaning, unfortunately 100% of them pertained to car painting, but one of them mentioned different solvents for different materials, and the guy said to use laquer thinner or acetone for “waterborne acrylics” which is (as i understand it) what water based wood finishes are. so i went and got some acetone and a new gun (a home depot husky something-or-other), brought it home, cleaned it all out with acetone, then filled it and started spraying. once done i took it apart and started dropping pieces in the acetone, i eventually realized that acetone immediately turns waterpoly into rubbery schmutz, which i’m fairly sure is caked in my new gun now, despite thorough and feverish cleaning.
My question is: What should i use to clean my hvlp gun after spraying? I’m concerned about water because it takes hours to dry and causes rust, also the shiny parts of the gun don’t look shiny anymore after cleaning with water. I scoured the internets and couldn’t find a single reference to this, apparently everyone knows something i don’t.