Hercules Pro Dope is an oil-based thread sealant with a uniform, smooth consistency that ensures an easy, drip-free application. Use in pipe systems carrying water, natural gas, air, steam, ammonia, brine, diluted acids and alkalis. Both lead-free and non-toxic, Pro Dope is FBC-approved for use with BlazeMaster, Corzan and FlowGuard CPVC piping systems and can also be used with certain PVC piping (confirm compatibility with manufacturer). This pipe joint compound wipes away with ease, and its gray color blends in with metal piping for improved aesthetics. Behold the power of Hercules®, products built to last and trusted by plumbers to withstand even the toughest conditions.