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I've even used Hydrocal mixed with Dental casting powder. The Hydrocal increases the setting time. Dental casting powder for those who havn't experienced it sets quick and becomes as stong as concrete!. If you mix large quanties it sets as you mix it. I once did some curved platform tops with it, thinking I could sand it to a smooth finish. No Way. I ended up using a sharp chisel to get the finish I wanted!!!!. There's no big deal with Polycell, polyfilla, and I'm sure by now you have the general idea.
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