Cool air guns should work, but you need a massive compressor to run them. Something like 8.5 SCFM for the small models I think. What about a micro-mister like the Trico micro-drop? No mess with that one. I will be trying the lithophanes on acrylic in the next few weeks with the Trico unit, if you can wait that long, I will let you know how I get on.
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