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.
Noted, not had that problem with it myself although I usually use it to stick the bath/shower tray to the wall and add a decorative coloured sealant on top, often from Mapei (usually Jasmine !!)
@Airhead 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.