CT1 is paintable but also very good in baths and showers.
Disapointingly, white CT1 didn't stay white for more than a few weeks around my bath.
Not many things work for all problems and they now have a bathroom version.
Is it mould?
Top tip, pour a bit of bleach round the edge of the bath where you’ve sealed it and cover with paper towels (to soak up the bleach and help cover all of the sealant). Remove after a few hours and rinse - et voila, no more black mould.
@Nef started
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Disapointingly, white CT1 didn't stay white for more than a few weeks around my bath.
Not many things work for all problems and they now have a bathroom version.