Silicons from real word experience is fine on stuff like this
From my real world experience I'd say PTFE tape > silicone but I agree about slathering joints in anything.
The main issue with this particular waste seems to be that it's not screwed on straight!
@lemonade I would say @withered_preacher is right, get a different plumber. I could do a lot better than that myself and my plumbing experience is pretty limited...
But its all horses for courses, PTFE tape wouldnt work on what is being described with a waste, so I would always silicon it top and bottom as the washer never seal if you do it dry. You couldn't PTFE tape a flat washer.
From my real world experience I'd say PTFE tape > silicone but I agree about slathering joints in anything.
The main issue with this particular waste seems to be that it's not screwed on straight!
@lemonade I would say @withered_preacher is right, get a different plumber. I could do a lot better than that myself and my plumbing experience is pretty limited...