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One of the houses I lived in during college had rounded room corners, and it was a very old house. I'm not sure how it was done.

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With a round trowel and/or a wood template.

I have some experience plastering. Round corners are somewhat easier than sharp ones. The plaster/joint compound tends to pile up quickly in corners and it is hard to skim it thin.

Traditionally it was done here in eastern block with a beer bottle. A tool always within reach of a builder.

How do you make a round corner with a beer bottle? I mean an actual corner (three walls meeting), not an edge (two walls).

Use the edge of the bottle base as a semicircle-shaped spatula and rotate the bottle as needed?

Beer bottles to make rounded corners? Brilliant!

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