Outside kitchen-sink drain pipe corroded

Anyone know what this grey sealant thing is?;





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What are you talking about?

This black one is brand new, the other one was 40 years old.

Unless I’m mistaken, a white one runs below the black one?

See photo:
 

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Oh I see but we were talking about the new black one.
Yes I know, but post number 44, 23vc said swap it to white, and I misinterpreted this, thinking it was meant the white one swapping for black. Wish I hadn’t said owt now :LOL:
 
Anyone got ideas on sort of protective paint that should be used for new black pipe?

Thanks.
 
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