Does anyone know of a supplier of anti-fungal paint?

The problem: a solid concrete (or other masonry finish) ceiling, the
shower steam goes straight up and condenses, with the inevitable result.

I'll be adding forced ventilation for the new occupants. However I would
like to know what paints are available which are truly anti-fungal?


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html