I have recently extended some pipework using compression fittings. It had been suggested to me that I should not over tighten the fitting as the olive could cut into the pipe. Now I have notice on a couple of the fittings that whilst they appear water tight there seems to be a powery deposit forming round where the pipe goes into the fitting. It suggests to me that I have not tightened them correctly but would appreciate any feedback.
Thanks
David - Milton Keynes