Hello, I’m building a bar based on ideas from the site. I collected many coasters from Europe back in the early 90’s and it’s now time to put them to use. I’d like to glue them to plywood and cover with Envirotex. Will the envirotex affect the coasters either by soaking in or possibly change the colors? I’m going to do a mock test but it would be helpful to know if this has been tried before or possibly experience with other porous stuff covered with the product. Thanks ahead.