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FAQ's - Treating Plaster for Exterior Use
All plaster ornaments, which are to be used for the exterior, must be given a heavy coat of linseed oil on both sides. After drying they may then be given a few coats of a good oil base paint either before or after installation. Installation should follow the instructions provided above with ceiling medallions. Once installed, the ornament should then be caulked around the edges to prevent water from getting behind it.