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Begin by sketching design on wall -- but do not sketch or apply plaster to a high-gloss finish.
Use any type of plaster, mixing only enough to work with a small area (1 to 2 square feet) each time. Plaster dries very quickly. Mix three parts of plaster to one part glue and one part water and stir until mixture is the consistency of cake frosting. Spoon mixture into cake decorating bag and add tip. Follow the pattern by squeezing the mix directly onto the wall surface. Start with the outline and fill in the design.
Allow plaster designs to dry, then use craft knife to carve details as desired (Image 1). Use base coat to prime the area. Once the paint has dried, use metallic nail polish (gold or silver works best) to add highlights (Image 2). For an aged look, add a few coats of glaze over the completed surface.