A blue, grit-free, slow, soft-set, non-hardening, non-toxic pipe joint compound. Will not transfer any taste or odor to the system being sealed. Excellent for food or potable water systems. For use on all metals, ABS, PVC, CPVC, fiberglass, nylon, polypropylene, celcon, cycolac, polybutylene, delrin, polyethylene and zytel plastics. Can be used on systems carrying mst liquids and gases. Not for use on oxygen lines.