I made a mold out of styrene for some piers and the first ones came out great but now it is starting to break off little chunks in the corners after the plaster has set, so I need a mold release, any ideas, soapy water did not work!
On my molds I use Pam kitchen spray. A light spray works well as a mold release for me.
Joe
I use vegetable oil, wiped on with a paper towel, but the spray stuff sounds like an even better method. If the plaster parts are coming out of the mould with bits missing, make sure to clean the inside of the mould thoroughly before your next casting job - the bits may be stuck inside.
Wayne
Mold is clean, that’s why I got confizzled! Just cleaned it again and used a wetter mix, will try Pam knockoff next.
WD-40 works well as a mold release if you don’t mind the smell.
Tried the Pam knockoff, we shall see as it is setting up now!