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Casting Unusual Shapes
I believe the Duck was way over watered. The cup on the other hand was not as over watered. Once I get my vacuum former back (tomorrow) I will redo the mold then put some more cement in it.
Casting Molds With Voids
ausing a DIY vacuum former and a shop vac I created two molds. One of a rubber duck and a lid to a spray paint can. Had to dremel the duck out od the mold. It proceded to self destruct. I will try again. The lid turned out good but the side fell out. Lesson= go slow whe taking cement out of the molds
Casting In Pre-made Molds
Mixing + Pouring Concrete