Cristian, try to print as usual on a piece of PCB, then quickly spray
paint the board as it comes out of the printer, with laquer. Wave it a few
times in air to dry the laquer a little and put it in a tray with water
and alcohool (Vodka may work). The bubble ink should dissolve and take the
laquer with it, leaving the laquer only where there was no bubble ink.

Try it and let us know ?

Peter

By laquer I mean spray paint (vopsea in spray ?)

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