Gummy sounds like it may cooking on you or the product is aged and cooked in the can.
How are you mixing? 
Look into clay for working with molds
There is liquid clay as well.
Can you make a straight jig and then use a portable router to cut the edge.


Sent from my iPhone

On Sep 24, 2014, at 11:30 AM, Baird Standish <bairdstandish@gmail.com> wrote:

Hi. We have been working with a bullnose in a terrazzo step. In order to get the curvature of the bullnose correct with less grinding, we have been experimenting with creating a mould. We successfully created a mould from the bullnose made of plaster reinforced with burlap. We then sprayed the mould with silicone and then filled with a combination of stones and terroxy. Unfortunately the terroxy attached to the plaster and is almost impossible to get off. I didn't think it would be so hard to remove. Wondering what material I can use between the plaster and terroxy that would create an easy separation. 
On another note, I mixed the terroxy as prescribed (5-1) and added the aggregate but some of it came out gummy. Maybe not enough mixing? Although I thought we mixed it pretty well. I have had this happen sporadically before. Any thoughts on the above?  Much appreciate it. 
Baird


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