GAF TPO WaterBlock Mastic Tube

A one-part, butyl-based, high-viscosity sealant suitable for sealing between flashing membrane and substrate surfaces, behind exposed termination bars, and between roofing
membrane and drain flanges. Install only where it will be concealed from UV exposure. 

Warranty:

The warranty will be honored only through the manufacturer, GAF. For your convenience, product warranty information is attached below; please click the link below to view the current warranty policy on the manufacturer's site. If you need further assistance regarding your coverage or have other inquiries, please contact the manufacturer directly.

Link - GAF Warranty Information