weeping plumbing joints

[kiwijbob]

I'm new to actual 'hands on' plumbing and I've recently installed a new
1.4 bar shower pump. all seems fine but I'm pulling my hair out trying
to stop some weeping where the male threaded part of the fitting meets
the female part of the shut-off valve as shown in the below link.
I firstly tried without any material to seal the joint using only elbow grease
which weeped, then I tried PTFE tape with no luck... it still weeped, I now
have the joints wrapped in Hemp & some copper joint cement, I'm going to
let water into the system this evening to check for weeping, if this weeps
what next???? I saw some white cement in B&Q, this maybe?

[broken link removed]

 

[Carpenter]

BOSS White and hemp fibre is the preferred material for screwed connections like this- the jointing compound provides the seal while the fibre just reinforces the joint and aids the compound in filling large gaps. This should work ok.

 

[beldin]

Possibly heavier PTFE tape would help. I got some gas tape from B&Q a while ago. I had the same problem with a radiator valve. In the end several loops with the heavier GAS PTFE tape did the trick.

 

[Carpenter]

The yellow coloured, heavy gas tape is better alright but I'd prefer hemp and Doss white over PTFE tape any day, especially for this type of application.