Lightweight and durable, the medallions can be fixed to a ceiling surface with an adhesive, or by several drywall screws. Made from a polyurethane, they may be painted to match your room's existing color.
With a new fixture
When hanging a new fixture, begin by turning off the power to the light fixture at the breaker panel or fuse box. Do a dry-run assembly of all the medallion and chandelier or fixture pieces on the floor before proceeding, just to make sure everything fits. Depending on your ceiling opening, you may find it necessary to enlarge the center hole of the medallion.
After checking placement of the medallion against the ceiling, apply just enough adhesive glue to the back of the medallion so that the adhesive doesn't ooze out when the medallion is set in place. Applying the glue about an inch in from the medallion edge is a good rule of thumb. Allow a minimum of two hours for the adhesive to finish drying.
Apply a bead of caulk at the perimeter of the medallion to cover any gaps between it and the ceiling surface. Smooth the caulk using your finger or a damp sponge. Once the caulk has dried, you can paint the medallion to match your existing ceiling decor.
Then, hang and wire the chandelier or ceiling fixture, then attach the fixture's decorative ceiling cap or flushmount as normal, making it tight against the surface of the medallion or ceiling.
With an existing fixture
When installing a ceiling medallion where a light fixture exists, the fixture must be removed and reinstalled after the medallion installation is completed. Begin by turning off the power to the light fixture at the breaker panel or fuse box.
With the power off, carefully remove the light fixture -- usually held into place with a couple of screws and-or a nut on a short length of threaded tubing. Lower the fixture canopy and carefully disconnect the wires. This is a great time to give the fixture a good cleaning or polishing. With the fixture down, simply follow the instructions above, installing the medallion, then reinstalling your ceiling fixture.