Providing it's clean is all that matters. Make sure you've removed all the old sealant. A blade from a Stanley knife will shave off any remnants.
I suggest you let it dry out fully after cleaning with a regular bathroom cleanser. 12 to 24 hours should do.
I'd recommend you use a silicone sealant of the best quality. Don't skimp on a few pennies or you'll only end up doing the job again in a year's time.
Colour is a matter of personal aesthetic.
Big Softy
December 2006
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