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Teflon tape only works properly on plastic fittings by design, by luck it sometimes gets bodgers out of jail on compression fittings. What you need is a product called lsx, a little dab smeared around any type of joint, no too much, and you will be transformed into a plumbing god. A god with slightly sticky fingers but a god nevertheless.
Airhead-
Good to know about lsx.
Most amateurs massively overtighten compression fixings. As a complete amateur I did exactly this when doing the same thing and joining two hoses using a short bit of copper pipe.
Luckily I had just enough copper pipe left to try again. I tightened up each side the bare minimum I thought I could get away with, turned the water back on and then tightened it very slightly (1/16th of a turn at a time) until the leak stopped.
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Now I'm a little lost here, where is the ptfe tape going on the compression joint? On the threaded part of the joint or elsewhere. I know ptfe as a thread sealer and lubricant, so can be used in bleed nipples on brake calipers if you are using a method to draw the fluid through the caliper, the ptfe seals the thread but also acts a lubricant meaning that bleed valves have less chance of seizing. Hence using a few turns of ptfe tape if reusing an olive, in my case replacing radiator valves, to lubricate the join.
Greenbank
lynx
I have a couple of flexible hoses under my bath connecting the water to the taps. There are two each for hot and cold water with a coupler in the middle.
The coupler was originally a length of copper pipe with an olive and nut at either end. This started leaking so I took it off and replaced with a simpler option of one of these for both hoses to screw directly into
The bloody thing is still leaking though. Used half a dozen wraps or so of teflon tape but there still seems to be a dribble coming through.
Any suggestions? Shall I go back to another length of copper pipe and compression fitting? More tape?