Add just a tiny bit of cement dust. That'll stick to *anything*. The problem is getting it back off.
So how do you planish-hammer to leave a good flat surface? Are you doing everything with your small sledge, do you have one with rolled edges or somesuch to keep from leaving edgemarks, do you have a fuller or flatter?
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So how do you planish-hammer to leave a good flat surface? Are you doing everything with your small sledge, do you have one with rolled edges or somesuch to keep from leaving edgemarks, do you have a fuller or flatter?