Atlas Pristine Shingle Products now feature Scotchgard Protector by 3M, offering lifetime protection against algae staining. Atlas Pinnacle®, StormMaster® Slate, and StormMaster® Shake are now manufactured using copper technology developed by 3M to eliminate algae stains. The copper distribution and product integrity are verified daily by a third party laboratory throughout the manufacturing process to ensure optimum algae resistance and Scotchgard quality. Atlas shingle products featuring Scotchgard Protector by 3M come with a Lifetime Limited Warranty against algae