Are you using the photo
Are you using the photo paper that you print yourself? What is the firing schedule?
There’s lots of ways to go about this, but you need to keep records of what works and what doesn’t.
1. Make the cabs and then refire to 1350 degrees.
2. You can sift clear frit onto the glass and fire to 1400. If you don’t cover it well the first time, you might need to refire with additional frit.
3. Try the first method then spraying the piece with SuperSpray and refiring to 1350.
I picked up these ideas from someone else, but they work for the do-it-yourself photo paper. If you are using the colored decals or something else, stay tuned. . . .