We have a compression joint that has a very tiny weep, hardly anything. We nipped it up and it hasn't solved it.
Other compression joints on the same job have sealed perfectly. All variables that we have control over are the same.
From what I have read, paste is linseed oil and chalk. That would seem a good idea as the chalk could get into any micro gaps. Might try that.
What make should I get from Toolstation,
Wickes or
Screwfix ?