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I need to skim an area of wall below some stairs. There's a tight corner where the boards below the upstairs stairs meet a length of trim:

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Annoyingly, this is pretty much at eye level for anyone going down the lower set of stairs so I want to get a reasonable looking finish. (I'm using board finish on plasterboard.)

Any tips for getting into tight corners like this?

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You can use a mason's trowel. Or you can cut and modify a low cost 6 inch putty knife to fit the angle. When using either, drag the point out from the corner and keep the point of the tool in contact with either adjacent surface.

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