I'm working on my first one now. I've made Hypurtufa with cement, sphagnum peat and sand but wasn't overly excited about the results. This time I'm using a mixture of a colored, tri-fortified cement/grout used for ceramic tile, an Amaco product called Sculptamold (a paper based product)that's used for scupltures, and the secret ingrediant, 3/4" shredded poly fibers that help hold it all together. It's in the mold now and I should know in a few days how it pans out. Normally White Portland Cement should be used but I hate buuying 96 lbs. when I only need ten or fifteen. I'll keep you posted.