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Okay. I spent like a whole month putting this thing together because fucking cold porcelain is taking weeks to cure for whatever reason.
I tried to key the mold using the remains of some old building blocks and secure it inside a frame so the mold will be mostly square.
One thing, though. Does proto putty stick to rubber? The piece inside is one of the FE Optimus' smokestacks which is made of this crappy soft rubber that sucks dust like crazy.