Matthew wrote:
I didnt want to overtighten the fitting for fear of tank damage. It
only tends to weep
when the tank is over 3/4 full so it must be a very small area.

Yesterday I tried the following;

1) Just fibre washer.
2) Boss green and fibre washer.
3) Just boss green.
4) A couple of turns of PTFE.

A 160 litre drain down each time!
Just boss green gave the best seal.
A drip every 5 mins or so.
Im tempted to leave it for a week with the temperature cycling and see
if it
seals itself.
Another option maybe is to try another type of gasket sealant, any
ideas?
or maybe, rather than just a couple of turns of PTFE tape, try several?

Thanks for any advice,
Matthew


Only ever done one but I just used the fibre washer. I think the trick
is to tighten as much as you dare, fill the tank, allow the washer to
become totally soaked - it will leak at this point and then give it an
extra tighten. The fibre washer will compress a bit more when wet.