On 27/08/2019 09:25, Harry Bloomfield wrote:
Put some Plumbers Mait around the sealing points, plus long the threads
too, to be sure of no leaks. It's none setting, so comes off easily
where it squeezes out or if it needs to be disassembled later.

+1
Plumbers mait, I just fitted a sink waste and had small leaking issues
Plumbers mait resolved it.