I've mixed up a few batches so far and for me, it's just trying to add enuf water. I keep making it too thick. Once it's thin enough, maybe the consistency of pancake batter, I add some peat moss, and/or green moss, some kind of organic stuff to thicken it back up a bit. You can get very creative at this point -[/FONT]

I found your recipe interesting in that all the other ones I have seen on the net are for a much stiffer mix. Did you just pour it onto the flat surface and let it harden? The one's I have used in my vivariums are much thicker and mixed with peat moss, coco fiber, sphagnum moss. It was applied stiff and would immediately hold on a vertical surface. If fact this was my test to see if the clay mix was correct. I would set the tank back up so the clay was vertical and give it a few minutes. If it held then I would lay it back down and let it set/rest for a few hours. I did use horizontal lines of foam on my 40 vert as additional support for the clay background which was applied all around the foam planter locations.