Silicons from real word experience is fine on stuff like this, and Id say personally a poster saying it should be just tighter than finger is nonsense needs to be tighter than that. It needs tightened but not horsed.
Also slathering joints in paste after its fitted, if its gonna leak without paste it'll leak with paste and is just extra mess. Although I will say thats a thing that plumbers seem to be taught from working.
The main issue with most of this waste stuff and lot of taps and that is that its cheap chinese crap.
Sometime the advice on here is meh imo.
Silicons from real word experience is fine on stuff like this, and Id say personally a poster saying it should be just tighter than finger is nonsense needs to be tighter than that. It needs tightened but not horsed.
Also slathering joints in paste after its fitted, if its gonna leak without paste it'll leak with paste and is just extra mess. Although I will say thats a thing that plumbers seem to be taught from working.
The main issue with most of this waste stuff and lot of taps and that is that its cheap chinese crap.