baird,
can you get plastic wrap or wax paper to sit tight into your mold.
I would be cautious with anything that may wick into the mixture

Thank you
Carl Staples
Classic Marble & Stone Restoration
www.Marblerestore.com
610-356-4100
 

Date: Wed, 24 Sep 2014 11:30:05 -0400
Subject: Mould for terroxy - what material doesn't stick?
From: bairdstandish@gmail.com
To: sccpartners@stoneandtilepros.simplelists.com

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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