Advice- Do I need to use silicone/Fernox LS-X bath waste?

[bilabonic]

Hi All

My bath waste always seems to leak after a few months.

I have always fitted the cheap McAlpine £6 plastic type with push on overflow and used cheapest Screwfix silicone.

I have now purchased a proper McAlpine CBWF70CB as in pic.

I have been advised by local plumber to add a small smear of Fernox LS-X to all rubber seals.

Is this correct?

Thanks

 

[Laurieo]

Is there pressure on the waste pipe getting it into the trap, is the pipe supported. Even a cheap waste should last longer than a few months .
A smear of Lsx should not do any harm .