Sculpting Curved Crown Molding

If I run into curves, like bull-nosed drywall corners, when installing crown molding, I make my own "profile knife" out of a drywall knife and run plaster around the curve to match the wooden crown. Here is an article I wrote with the details: http://www.finehomebuilding.com/how-to/departments/master-carpenter/sculpting-a-radiused-crown-molding-in-plaster.aspx
The same techniques used to make these curved crown corners can be used to repair or replace damaged or missing paint-grade moldings. This is especially helpful for old homes if the profiles are not readily available. Custom millwork runs for small batches can be prohibitively expensive. So, making a profile knife and using plaster can be a good option.
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