Bought this specifically to use on badly pitted copper pipe (exposed to salt air). Did the best I could cleaning the pipe with 60 grit cloth, like instructed, but was highly skeptical due to the bad condition of the pipe. Instead of applying the glue in a wavy pattern, like the instructions say, I just put it on the (horizontal) pipe until it dripped off. Then coated the inside of the fitting, put it on the pipe, twisted for five seconds, then held it still for 7 seconds. Ten minutes later, it was solid.Could not believe it. The pipe was so badly pitted that the fitting wobbled on it before I glued it. Follow the instructions especially for prepping the surfaces.