Not cast White glue (Elmer's) on the backs then a coat of Modge podge Let that sit for a couple of days. Start off with a coat of thin CA, let that sit for an hour or so. Pending humidity of your location you could wait longer or shorter. BUT I do not use accelerator! I let all 15 plus coats of Medium after the 2 thin to dry for at least 15 - 20 minutes.Very nice! Did you cast them or put them on like stickers?