None. It helps a little, but most of the prints still come off. I went back to glue sticks. release the prints. I think it was a waste of money. Spend and learn. UPDATE: I've had issues with prints peeling off the glass or the first line not even sticking. I read the reviews and thought everything should work. I have an update. I've found that it works MUCH better if I apply a first coat, let it dry, and then apply a thick coat just before printing. The first layer forms a film to which a thick second layer can adhere. It works best when the second thick coat isn't completely dry yet. To reprint, I take a damp cloth to the bloated area, wipe it off a little, and then apply a thin layer on top. Since it works for me, I increased the stars to three.
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