The constant rain and high humidity has given me a lot of a problem with mould as well. I don't think it matters what paint you have it forms on all types and on plastics as well. I have found that oil of cloves is the best to control it. Google AI covers it nicely. Just be aware it is very unpleasant to breath the fumes.
I tried a 12V Humidifier but very heavy on batteries. The one I have was 5A 24/7. I've just cleaned the V berth Im thinking Ill paint half with Bunnings anit-mould paint and see what happens. Anti-foul works!
