dom92 Posted April 23, 2018 Report Share Posted April 23, 2018 Do the experts here have any sage advice on the best plaster materials to use for making a good slip casting mold? Until now I've used a wide variety of commercially produced slip casting molds and they've all been excellent in quality and construction. Nice rounded edges and very durable. I've even dropped a few here and there and all they did was leave a dent in my vinyl floor. Anyway, this weekend I wanted to take a shot at making my own slip casting mold using plain old plaster of paris bought from the local hardware store. It "works," but I can already tell this won't hold up for long. One drop, even to countertop level, and it'll probably explode in to a dozen pieces. I'm thinking this primarily due to the type of plaster I used to make it. Do the commercially produced molds use a different kind of plaster? I do have a bag of jewelry casting investment (which is primarily POP), and I was thinking of giving that a try as I know from experience how smooth and durable it is. I just don't know if it will absorb water from slip properly. Link to comment Share on other sites More sharing options...
Fred Sweet Posted April 23, 2018 Report Share Posted April 23, 2018 dom02- Your best material is #1 Pottery Plaster from USG. https://www.usg.com/content/usgcom/en/products-solutions/products/industrial-and-specialty/ceramics/usg-no-1-pottery-plaster.html Use their data sheet for mixing instructions located at the bottom of the link above. Regards, Fred Link to comment Share on other sites More sharing options...
dom92 Posted April 23, 2018 Author Report Share Posted April 23, 2018 Thanks, Fred! I should have guessed that there was a special mix out there. I'll give it a try! Link to comment Share on other sites More sharing options...
oldlady Posted April 23, 2018 Report Share Posted April 23, 2018 try not to drop the mold. it could bounce onto your toe. Link to comment Share on other sites More sharing options...
Mark C. Posted April 23, 2018 Report Share Posted April 23, 2018 (Your best material is #1 Pottery Plaster from USG. https://www.usg.com/content/usgcom/en/products-solutions/products/industrial-and-specialty/ceramics/usg-no-1-pottery-plaster.html Use their data sheet for mixing instructions located at the bottom of the link above.) Fred is spot on.This is the best for molds. Link to comment Share on other sites More sharing options...
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