Then smooth out with another credit card to make sure you have no bubbles. I don’t know how well it would work for a large area but it works remarkably well on sheet size pieces of paper. Then I let it sit for a minute to achieve a tackiness as the water evaporates. To prevent the wrinkles from Mod Podge in paper, after I spread it on the surface, I squeegee the surface with an old credit card or plastic hotel card key to get as thin a layer as possible. Just wanted to share a few tips I’ve found handy when dealing with some of the issues you mentioned (I always feel, what good is knowledge if you can’t share it). Hi – loved your tutorial and plan to use it for my daughter’s wedding this fall whereas the jumbo prints we had been looking at from websites were hundreds of dollars.