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U.S. Gypsum
Made with a paper tape laminated to a rust-resistant metal form, Sheetrock Premasked L-Trim has a masking strip that protects the adjacent surface during application and tears away when the job is complete, leaving no cleanup. The tape-on application is designed to ensure proper alignment where wallboard abuts suspended ceiling grid. Other applications include doorjambs and windows to protect door casings and window frames.
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