"I have already made several molds for glass casting and I really like this material. It's much easier to use than Castalot or plaster - and seems to produce very nice molds.
I really liked the calculator for determining water and investment ratio. I'm mixing with a mixer on a drill - that works well. On one of 4 molds I made yesterday I tried to push the mold out of its plastic container too soon - and the mold cracked. The other 3, where I waited a bit longer were just fine. You may want to mention that letting mold set for at least 1/2 hour improves quality in your usage notes.
Overall I found your usage notes very helpful but I am still learning some stuff on my own."