Alex wrote:
If this is internal, caulk should be used,sounds like silicone has been used
instead and without a fungicide mould will grow

I've used several types of silicone with fungicide in the past in
bathrooms, and can't say that I've noticed any difference at all in the
growth of mould compared to 'normal' stuff.

Somebody once told me that you shouldn't use a biological tool (aka a
finger) to shape the silicon bead as that introduces bugs before it's
cured - sounds like total tosh to me. Anyone know if there's any truth
in it?

David