CertainTeed’s No-Coat drywall corners can help finish off angles, archways, and corners with optimal strength and performance. The company says the product’s “Structural Laminate Corner System” integrates three components: a tapered copolymer core that withstands severe impacts, joint tape that bonds corner to drywall with mud, and a formulated surface paper that eliminates cracks and peeling, resists abrasion, and accepts any finish. No-Coat comes in outside and inside 90°, bullnose, L-trim, and arch profiles. We found an 8-foot length of outside corner for $3.28 online. certainteed.com