"Typical bank hol,Water leak in kitchen!! Copper pipe to Plastic stop cock.Bank hol call out very expensive so tackled the job my self.Made new pipe to stop cock and still leaked.Purchased Fernox Water Hawk at Srewfix,followed instructions and leak does not exist any more. Best thing since sliced bread."
"Fantastic jointing compound for use over the top of olives in compression fittings (not to be used under the olive though as apparently it can cause the olive to slip). A thick paste that you spread over an olive prior to assembling the compression fitting - makes it much easier to avoid any seepage on the joint. I've read that true pros use this stuff (rather than PTFE tape) on compression fittings and it really is superb. This stuff is nice and thick so doesn't run off the joint, and is suitable for drinking water fittings too.
I actually had a leaking air bleed valve on a new Stelrad radiator - PTFE tape on the bleed screw was a nightmare so I tried a splodge of this - worked a treat until I got a replacement valve!
"Never suffered from leaking compression joints when served by Thames or Bristol water, plenty of Calcium Carbonate+ just used PTFE tape. Northumberland water appears to have very little dissolved salts.Much to my surprise found compressions always had tiny amount of seepage, used water Hawk no problems at all, will use it all the time now."