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1. Alunar® Coating System embedded with Dupont® Teflon® Surface Protector (Metal Roofing Systems/Standing Seam Roofing) 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 ... 2. Shingle Roof Colors (Metal Roofing Systems/Shingle Roofing) Interlock® Shingle roofs are exclusively protected for a lifetime by Alunar® embedded with TEFLON® surface protector for ultimate durability and protection. Aged Copper Solid ... 3. Standing Seam Roof Colors (Metal Roofing Systems/Standing Seam Roofing) Interlock® Standing Seam roofs are exclusively protected for a lifetime by Alunar® embedded with TEFLON® surface protector for ultimate durability and protection. Aged Copper Solid ... 4. Slate Roof Colors (Metal Roofing Systems/Slate Roofing) Interlock® Slate roofs are exclusively protected for a lifetime by Alunar® embedded with TEFLON® surface protector for ultimate durability and protection. Aged Copper Solid ...