Hello. I would so appreciate if anyone could give me advice on how to best seal photo paper onto ceramic tile for end use as a coaster. It's pretty difficult to source Mod Podge where I live. I use ink jet on photo paper, then use a fixative to set the ink. Then I glue on the photo paper to ceramic tile with acid free glue, or non-toxic school glue. I've tried to use finish off the surface with acrylic epoxy spray paint (clear lacquer) but that finish seems thin. I've also tried brush-on acrylic sealer on the surface of the photo paper as well as around the sides where the edges meet. It's a bit heavier than the spray paint when applied but sometimes condensation from glass still gets through - especially at the edges where the photo paper edges meet the ceramic tile.
Any other recommendations as to what I can use to seal photo paper onto the ceramic tile AND keep out moisture from seeping in underneath or on top of the photo paper?