99% of the time I use Boss White for olive compression joints, etc.
I keep a tube of LSX for problem joints. For example, the other day, I had a new microbore pipe to rad valve joint that just would not stop weeping whatever I did to it. The joint involved those reducing set olives.
Generally don't use it but had to make up some cast iron radiators last week, previous lot leaked from the section joints as no sealant was used on the gaskets, as per manufacturers instructions. Sealed these latest ones with LS-X and no leaks!
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