Mod Podge. Love the stuff, but after a while it can get quite expensive. So for years now I’ve used Elmer's School Glue. I buy it by the gallon and make up the Mod Podge recipe as I need it in a mason jar. Just add half water, half Elmer's glue, replace the lid, shake it up and you’re ready to go. If you need it thicker, use less water! My preferred rate of dilution is 3/4 Glue, 1/4 water.