Hercules® Megaloc® is a soft-setting blue thread sealant made with DuPont™ Kevlar® for use on metals, including steel, stainless steel, brass, copper, aluminum and plastic. This pipe thread sealant wipes clean from hands and tools with a dry rag and is safe to use with water lines. Its odorless formula is non-separating, non-flammable, non-toxic and non-hardening. Behold the power of Hercules®, products built to last and trusted by plumbers to withstand even the toughest conditions.