Home DIY

I was thinking of using bathroom paint throughout, just incase the humidity issue returns in future (i.e. we rent it out to idiots).

Is this madness?

Not madness but may not be cheap.

http://www.dulux.co.uk/products/kitchen-plus-matt/

and

http://www.dulux.co.uk/products/bathroom-plus-soft-sheen/

both worked for me (two coats), the kitchen one being unbelievably easy to clean for a matt finish.