Bathroom mould growing AFTER applying anti-mould paint

I was repainting my bathroom. Couple of dark mould patches but nothing too bad. Stripped the old paint off down to the plaster, applied mould remover to the areas that were affected, wiped it down, left it to dry, painted with mould guard paint. Within 48hrs, a ton more mould than was ever there before has pushed out from behind the paint causing it to flake off. Any ideas on why this happened and next steps??

Advice from 4 local tradespeople

Although they seem very similar, damp and condensation are different issues and require different solutions. Hence, there is also a significant difference between damp proof paint and anti-condensation paint. It does boil down to the same thing: moisture is either finding a way into your property or cannot find a way out. A healthy property needs to breathe, with good air flow and ventilation. A little dampness and moisture is natural, it’s when the excess has nowhere to go that the problems start. To understand what type of paint you need, damp resistant or condensation resistant, you will first need to understand which of the two issues you are dealing with.

This happened beacouse is not enough ventilation on the bathroom , the window need to stay open ( if there is one ) . The bathroom might have damp issues as well .Without not solving these 2 factors the mould will be keep coming .
1 option is creating more ventilation points other one is to some plastering works and damp proof repairs etc.

Wall area possibly damp some exterior work need attention

The problem you are facing is damp within the walls it will be need to be treated from out side to inside this will take a while for it to dry out unless u act now to stop it applying mold paint on top of this situation will not help it will just progress even faster
Make sure the room had air flow maybe open window get a dehumidifier in the room I would recommend someone coming in to help you
Hope this answers you questions kind regards John

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