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discolored hydrocal castings
I have been pouring hydrocal in urethane molds and have consistently
had problems with slight discoloration in the castings. The discoloration is grey, sort of splotchy, sometimes a little cloudy, altogether annoying. Am I wrong to assume that hydrocal should always cast white? I've been using white dish soap for my release. I lightly mist the mold with an fine-spray atomizer. I've tried a number of different pouring strategies thinking that maybe my pour rate was too fast. I've mixed the hydrocal by hand and with a mixer, thinking that the mix was the problem. I've called the techs at smooth-on and at poly-tek looking for answers. Could it be my water? Is the urethane not entirely mixed in areas. It seems completely cured. Should I give up on this mold and start over? Has anyone out there had similar problems? I just want a nice white finish. No fuss, no muss. The material is what it is. Looking for answers from plaster/gypsum masters. Any help is greatly appreciated. |
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