I mud, too. Like Morton, after reading a lot on it I used some ash from burned match sticks mixed with pipe ash, ground up mortar & pestle-style then sifted through an old kitchen screen-strainer to make a nice fine ash. I used saliva and mixed it thick on a piece of waxed paper then applied with the spoon on my Czech tool. I let it dry two days, smoked it, two more days and it is set like a rock. It not only evens the bottom but also fills in the side gaps, too, making it a perfect smoker. And a very easy fix to boot!