chris French wrote:
When I mated a plastic soil pipe into a socket on my CI soil stack I
used some 'roof and gutter ' sealant that I already had. This was not
a
normal silicone type sealant, it was black and a bit more
'rubbery/tarry' maybe. Anyway it worked fine.

That's the stuff. It was easy to find in the local hardware store.
However, it appears to be made out of the same stuff as the bowels of
hell itself - it smeared itself very effectively not just all over the
waste pipe, but also on fingers, clothes, threads and washers of
compression fittings, joints of solvent weld fittings, carpet, taps and
the lid of the swarfega tub.

After exorcising the gunk from everything, I gave up on it and instead
made a thick bung from alternate layers of rubbaweld and plumber's
hemp. This seems to have made a tight and firm fitting. I then packed
in more hemp and finished off with a hearty topping of Plumbers Mait.

Hopefully tomorrow, after the solvent welds have cured, it will stand
up up to the bathful of water test...

Vaci