After a week of assembly I finally got around to coloring. I spent 2 days painting my entire large display and after everything was dry I finally used the grass glue. After spraying everything and waiting half a day. I touched it lightly to see if it was still dry, it was still damp so I waited until the end. Even grass dust does not stick to the clay after drying! WTF! I bought hundreds of dollars of woodland painting materials, and now that I finally got to the last part, I realized that "cement" wouldn't even hold tiny bits of grass or anything together!