You are close ...you guys are dancing all around it but your close....zagadka said:to me, it seems like a bad idea to flash the ink and then do another pass. it doesn't have fibers to absorb into or latch onto, so it just kinda sits on the surface. just like how you're not supposed to pour wet concrete onto concrete that's already cured.
Your almost correct about it having nothing to latch onto but thats only if you flash past the gel stage if your actually curing the first print then the seond print will flake off quickly.....however if the first print is just gelled then the second applied over it the Plastic Molecules will still lock together during full curing.... Thats sounds like the most probable cause of the problem your having....
If not and you are not getting the first print to hot....then the most likely thing that will cause it to flake during washing is that final cure tempature wasnt reached.... Good Luck with it..... Chuck