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1. Interlock Industries, Inc. (Homepage/Welcome) ... and strength over time Environmentally friendly State-of-the-art Alunar® Coating embedded with Dupont® Teflon® Surface Protector A wide selection of styles and colors An extensive Limited ... 2. Alunar® Coating System embedded with Dupont® Teflon® Surface Protector (Metal Roofing Systems/Interlock Roofing® Slate Roof) The Interlock Roofing System has a multi-layered coating system, Alunar®. Interlock Roofing® Slate roofs are exclusively protected for a lifetime by Alunar® embedded with Dupont® Teflon® Surface ... 3. Alunar® Coating System embedded with Dupont® Teflon® Surface Protector (Metal Roofing Systems/Interlock Roofing® Shingle Roof) The Interlock Roofing System has a multi-layered coating system, Alunar®. Interlock Roofing® Slate roofs are exclusively protected for a lifetime by Alunar® embedded with Dupont® Teflon® Surface ...