Had a pinhole leak on a copper pipe at a joint. Water had been off for over a week. Dried and cleaned per instructions. Had a heck of a time getting it to adhere to the pipe but after it was, waited 3 hours and tried it. Almost immediately saw it leaking with water on the outside of the putty. Went through the entire tube by the end and no better off than when I started.
Rating: [5 of 5 Stars!]