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A half-round arch over a window or doorway is one of the quickest ways to make an opening look built-in. Spectis arch trim is molded high density polyurethane (HDP), shipped primed and ready for paint, and it is handled the same way as wood millwork. This guide covers how to choose the right arch for your opening, which straight casing matches each profile, and how to install arched window trim indoors and out. What Arch Trim Is (and What It Is Not) Arch trim is curved casing that frames the …