WC waste to soil pipe best practices?

I think the OP is asking about sealants to stop leaks EF.

My answer is nothing

For the soul pipe to slip into the pan connection then Vaseline, washing up liquid or as EF says silicone grease or spray.

Thanks for the replies.

I have both vaseline & silicon spray to hand so I have a chance of getting it on there.  (It's a straight connector in this case not an elbow).

For background - I'd seen someone squirt silicon seal into the soil pipe end before pushing in the fin end of the connector.  I wondered about how that would come out if ever needed. I also heard washing-up liquid will rot seals so not wanting the explosive blow-out that is possible I really wanted to hear from the experts
Water has a way of finding it's way out of things, but having stuff like push-fit plumbing about now I hope that the pan connector will behave.

TBH I am not looking forward to the job, but I think I can do it...  will let you know at the weekend (if I am not swimming around!).

   Agreed, I hate the ruddy stuff.

   It's very tempting to squirt a bit on for luck when you're fitting a WC, but I always think of the poor person who's

   going to have to scrape all the old silicone off when it needs some maintenance.... it might be you!

  

Just pull it off & put the new one on

They're maybe some shit in the old one so I'd glove up & have a black bag close.

Good luck

I've managed to do the WC and decided to also do the washbasin.
As it turned out the biggest problem and the things which took the most time was extracting the old screws/porcelain.



The original builder had simply used four-inch flathead screws to attach everything. These had rusted solid & obviously the heads 1/2 broke &/or twisted. Of a total of eight screws only three could be extracted 'normally'. I ended up breaking the wash basin and its standing pillar to get them off the last of the screws which then were extracted using grips to turn them. I would have been happier if the heads had sheared off so I could then cut them off flush but that wasn't going to happen.



So my fears of rampant soil/water release have so far been avoided. Once the screws were out I was able to move the pan and with a little bit of wiggling pull the original soil connector out of the grey soil pipe. I used a little vaseline on the WC spigot but left the soil pipe untouched and pushed it all together. Quite surprised how flimsy & brittle feeling these new flush siphons etc are.... but they are working properly!



And talking of annoying screws, the supplied new screws for the WC pedestal weren't of very good quality and heads stripped whilst I was trying to screw them in (by hand). Replaced with harder screws


I only had one wet problem with the wash basin and that is the existing bronze coloured plastic pipe for the drain. I fitted a new bottle trap and that is watertight and has a watertight connection to the original waste pipe but where there are elbows, the pipe join has obviously been disturbed and 1 is weeping slightly when I drain the sink.

As it's not under any real pressure I decided to use plumber's mait, squashing a sausage around the elbow unions that are weeping. As these elbows have a lip I've used is that to seat the plumber's mait.


Hopefully this will be sufficient but I'm wondering if this is a bodge too far and if I should in fact strip the old pipe out and create a new run of waste pipe or dismantle & reseal (how did this stuff seal up normally/is it obsolete?).
The existing run has 2 elbows and 2 straight links connecting to the wall/outside drain pipework.

It is the top elbow that is next in line from the bottle trap that is weeping at both connections.



Maybe you guys have an opinion on my use of plumbers mait for this issue?  What do you pros do? 

basin wastes are always troublesome, always buy Mc Calpine traps, they are quality and seal good, As Arfur says with the coppertone fittings, if that fails get some new pipe and fittings, they are all the same size and cheap, any compound/silicone on a waste is a bodge and won't last long,