Fitting Ball Valve Issues, please help.

[Best]

Use paste. V2 Lube is good, but you could buy cheaper pastes.
I wouldn't really want to even do a compression joint that was to be a temporary few weeks joint without paste.
Never seen a brass compression fitting that I could guarantee won't have slight weeps without paste. And it is so much easier to compress a fitting that has paste on olive, as less friction.
A microscopic leak you won't see, but you will see the corrosion on the fitting and pipe after a few months or years. A seized fitting is a result of this also.

 

[Radioman]

Always kept a couple of slip compression fittings in the van for those Sunday afternoon " my husband just punctured a pipe" calls.

 

[kay-jay]

I'm with best on the paste thing.
Best to use it as without it you may think joint is tight but actually may have an undetectable microscopic leak which only shows after a significant time.

 

[ZINXYX]

Thank you everyone. This was finally sorted last night. I used PTFE tape on the olives both for the straight compression coupler and the gate valve. Phew this was one heck of a job for me. At least I can learn from the experience. However I have another issue that is on this thread http://www.ukplumbersforums.co.uk/b...oms/86356-shower-not-working-please-help.html . Any help as always much appreciated. Good morning.