An example of ornate plaster molding.
Ornamental plasterwork goes back centuries, evolving over the years until becoming a central part of Victorian architecture, a decorative style that remains popular. While traditional moldings were made with layers of a lime-based plaster, most modern ornamental plasterwork is done with plaster of Paris. Add embellishments to walls, ceilings and cabinets with molded plaster pieces you make yourself; ornamental molds can be found online.
Instructions
1. Whisk together 1 part water and 1 part plaster of Paris in a bowl.
2. Coat the mold with cooking spray.
3. Add 1 more part plaster of Paris to the bowl and whisk together until fully combined. Pour the mixture slowly into the center of the mold until it is just filled. Tap the mold gently on the surface to release air bubbles.
4. Scrape the surface with the edge of a paint stirrer or other straight object to create a flat back for the molding.
5. Dry the plaster in the mold for about an hour. The plaster should be hard and cool to the touch.
6. Remove the plaster from the mold by turning it over and gently lifting the mold away from the piece. File away any rough edges. Allow 48 hours for the piece to dry completely.
7. Apply joint compound to the back of the plaster molding with a trowel.
8. Press the back of the plaster piece on the wall or ceiling where desired. Hold for about five minutes. Add more joint compound to seal the edges, if necessary.
9. Paint the mounted molding, if desired.
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