annbclay Posted March 31, 2010 Report Share Posted March 31, 2010 Is it possible to make a plaster hump mold of a straight sided, deep Tuperware type container? I've tried it once, using Murphy's oil soap as a release agent but I can't get the plaster hump out without cutting off the plastic bowl. Any tips? Ann B Link to comment Share on other sites More sharing options...
Linnet Posted March 31, 2010 Report Share Posted March 31, 2010 I use something called 'soft soap', not really a soap, but must be similar to what you already use. I've heard of some using the can spray cooking oil but I have never tried it. Good luck Link to comment Share on other sites More sharing options...
timj219 Posted March 31, 2010 Report Share Posted March 31, 2010 Is it possible to make a plaster hump mold of a straight sided, deep Tuperware type container? I've tried it once, using Murphy's oil soap as a release agent but I can't get the plaster hump out without cutting off the plastic bowl. Any tips? Ann B No art without sacrifice. The tupperware will go to its reward knowing it gave its life in a good cause.Petroleum jelly might do the trick. Link to comment Share on other sites More sharing options...
Zygote Posted March 31, 2010 Report Share Posted March 31, 2010 Strait sides = friction and drag. You can try "Burping" the mold. This is where you use compressed air to pop the seal between mold and master. Other wise, cut the bowl. Link to comment Share on other sites More sharing options...
Carl Posted March 31, 2010 Report Share Posted March 31, 2010 If there are no undercuts, petroleum jelly should work... at least it seemed to work well for making bronze casting molds from plaster. Normally one uses something with a slight inward slant to make releasing a bit easier. Link to comment Share on other sites More sharing options...
Linnet Posted March 31, 2010 Report Share Posted March 31, 2010 Maybe wrap tightly kitchen cling wrap without creasing over the surface of the tupperware, just a thought. Link to comment Share on other sites More sharing options...
Brenda Posted March 31, 2010 Report Share Posted March 31, 2010 Is it possible to make a plaster hump mold of a straight sided, deep Tuperware type container? I've tried it once, using Murphy's oil soap as a release agent but I can't get the plaster hump out without cutting off the plastic bowl. Any tips? Ann B I use baby oil. It hasn't failed me yet. Brenda Link to comment Share on other sites More sharing options...
Linnet Posted March 31, 2010 Report Share Posted March 31, 2010 This actually sounds more like a slab construction method to me. Link to comment Share on other sites More sharing options...
annbclay Posted April 2, 2010 Author Report Share Posted April 2, 2010 thanks guys, I'll try again. This one will have to sacrifice it's tupperware though. As you said, the price of art! Link to comment Share on other sites More sharing options...
Cindy in SD Posted April 2, 2010 Report Share Posted April 2, 2010 Just a thought, but I like to use bisque molds. That is, if you're hand building--if you're pouring, then never mind . . . . I just throw a piece the size and shape I want, then trim the outside to be nice and smooth. That way I can coil/puzzle/pound my clay over the outside or make a smaller piece on the inside. Link to comment Share on other sites More sharing options...
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