I am spraying a couple of layers of egg shell glaze on some test tiles. the first layer is slightly less than 1 mm thick and it is sticking fine. the second 1 mm layer, applied some days later, is sometimes peeling away from the first layer of glaze.
however, on the majority of tiles,, it works just fine. I can't figure out what the difference is between the handful of tiles that the second layer peals away from the first when dried and those that it sticks just fine.