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I built up the cast with spackle and started to carve it back down. However, I soon decided to build it up some more before doing this. I will put on another layer of spackle after this one. I hope that will be enough.
I've lost the exact outlines of the letters, which is too bad. I'll have to trace them onto the plaster and carve them out.
I probably could have avoided having to do this by making sure the sides of the cut out letters were perpendicular to the surface and the bottoms were flat or by starting with a wax positive in the first place. However, things usually don't work right the first time and it was worth a try using a wax negative.
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