On 2007-12-19 12:33:20 +0000, "
said:

How much should I be paying for a decent tube of silicone to seal
around basin and bath?
Screwfix have tubes ranging in price from 2 pounds to over 8 pounds.
At the top end of this price range are you paying for the "label"?

Nope.

You get what you pay for. Early failure means having to re-do the
job plus the cost of a silicone remover product to it. It's a false
economy to buy unknown cheap rubbish.

Dow Corning have a wide variety of products all with detailed
specifications on their suitability. IME, they exceed the claimed
specs and lifetimes.