I've learnt the hard way that despite what it says on the tube Everbuild Bath & Kitchen Sealant wasn't suitable for sealing round our kitchen worktop - it set almost hard (not flexible & rubbery like it says) and cracked after a few weeks.
Everbuild confirmed on the phone that that is indeed what it does.
They have a product called Forever White (at three times the price) which should be more suitable. I haven't tried it - I used Evostik White for Life, and that has been excellent.
If I'd known at the time how cheap the Bath & Kitchen Sealant was (someone else had kindly bought it for me) - £1-59 a tube - I wouldn't have believed what it said on the tube and wouldn't have used it in the first place.
Live & learn!