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Old 02-05-2013, 07:33 PM   #1
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Trouble with diy rock project

I read all kinds of articles on people making their own rock formations with grout and styrofoam so I gave it a try. I just can't get the grout to stay on the styrofoam. I put about an 1/4 inch coating on it and let it dry for three days. When I picked it up, the grout chipped off in several places. It just cracked off. I am going to recover it with Portland cement and see if that works. I have tried several different Styrofoam shapes and the grout will not stay on it. Is there some trick to making it stick?

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Old 02-07-2013, 10:02 PM   #2
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Try going with thinner grout, just a bit thicker than water, and apply thin coats with a paint brush
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