The reason for putting up the scaffold tower at the weekend is to attend to various bits of tidying up & repair needed.
One of these is a cast iron soil pipe/vent whose paint has been peeling off & which includes a Y junction from an upstairs loo. This junction leaks a bit. I’ve raked out whatever sort of loose caulk was used in the 1950s and want to re-seal the junction. Any recommendations? There appears to be various 2 part epoxy formulations available, some of which are putty type stuff, some not.
I’ve wirebrushed off loose paint + rust and applied rust inhibitor. Just want to know what might best fill the space around the pipe inside the collar.
I’m not 100% sure Guy but I think they used tarred yarn and putty 
I suppose the biggest concern is the expansion/contraction of the cast iron. so the joint needs some flexibility which rules out epoxy.
What has come out does seem to have been fibrous, almost like old cardboard.
Asbestos always used to look grey & be somewhat brittle. Shit infused asbestos though? 
Hoping @A_Touch_of_Cloth might contribute here!
How about plumbers mait
Assuming it’s not pressurised it seals, flexes and can be removed as needed
Pretty sure you can paint over but check
Have been looking at that & wondering why not.
There’s also a sealant called CT-1 which people use for this sort of thing.
Ideally the whole lot would be replaced with plastic but trying to see if a fix is possible.
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I use ct1 a lot, it’s glue through so if you need to get it apart ever that’s a consideration
Ct1 is the dogs for most applications, you can apply it underwater apparently so will defo seal your drain
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Defo not worth replacing as cast looks nicer and will repair and paint imho
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CT1 would be my guess too.
It’s a great product and completely waterproof
If I were you Guy for peace of mind and while you’ve got the tower up, I would replace it with plastic.
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Particularly if you are staying there for a while
CT 1 or Pro flex 40 are the dogs. It does bond, even underwater as TJ said! It’s used as a bedding compound in FG marine craft, initially developed as a filler between stone facsias on high rises. Have used it for over 10 years now, it does and will remain flexible.
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