LauraL Posted May 29, 2020 Report Share Posted May 29, 2020 Hello everyone, this is my first time on the forum, so glad I found you all. I wonder if anyone can help me with my slipcasting problem? I have made a narrow (4cm) and tall (26cm) cylinder mould and although the first cast came out satisfactory, the next three have came out the mould with the bases ‘sucked’ in/imploded. Could it be that the opening to the mould is too narrow to drain the slip? Or could my slip be too thick? When I cut into the cast it was still filled with slip about a quarter of the way up the form. If my slip is too thick, could I add a little water to thin it down? Many thanks in advance for your advice. Laura Link to comment Share on other sites More sharing options...
Min Posted May 30, 2020 Report Share Posted May 30, 2020 Could you confirm it was a casting slip you used? (sometimes people try casting with a watered down pugged claybody) Are you measuring the viscosity and specific gravity of the slip? Welcome to the forum Link to comment Share on other sites More sharing options...
LauraL Posted May 30, 2020 Author Report Share Posted May 30, 2020 Hi Min, thank you for replying and for the welcome. I am using ‘ready made’ casting slip from Potclays. (I am based in Scotland). The slip seems to be thicker now that I am getting near to the end of my supply although I am not sure why that would be. As I am using a shop bought product, I have not measured the viscosity. Is there a certain number this should be? Any help would be most welcome. Thanks. Laura Link to comment Share on other sites More sharing options...
liambesaw Posted May 30, 2020 Report Share Posted May 30, 2020 When the casting is sucked in it usually means it glugged when you poured it out, try really slowly pouring out. Link to comment Share on other sites More sharing options...
LauraL Posted May 30, 2020 Author Report Share Posted May 30, 2020 Thanks liambesaw, I will try this approach. Many thanks! Laura Link to comment Share on other sites More sharing options...
Mark C. Posted May 30, 2020 Report Share Posted May 30, 2020 Also make sure the mold is really dry before using-this also makes for issues like this. pour slowly as noted and let drain longer before taking mold apart. Welcome to the forum Link to comment Share on other sites More sharing options...
LauraL Posted May 30, 2020 Author Report Share Posted May 30, 2020 Thank you Mark. My mould is definitely dry, but I will make sure to pour slower. I appreciate you taking the time to reply. Laura Link to comment Share on other sites More sharing options...
Chilly Posted June 2, 2020 Report Share Posted June 2, 2020 On 5/29/2020 at 8:50 PM, LauraL said: Or could my slip be too thick? Yes, you can thin it down. It may be insufficiently stirred. I find the best way to "stir" slip, is to pour it from bucket to bucket at least 6 times. Link to comment Share on other sites More sharing options...
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