Paint falling off

Joined
11 Oct 2023
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Ireland
The paint in my parents kitchen is falling off the wall and I'm not 100% sure why. Last year there was a lot of mold growth on the interior block walls (ie not an exterior wall) and the paint was falling off the walls. I put this down to the fact my parents refuse to turn on the heating and use portable gas heater instead so when they are cooking the first cold wall moisture hits will be these walls thus causing condensation.

My father got some product from the local paint shop in a none labelled bottle but it smelled a lot like bleach and the drops the landed on my black jeans turned white. While my parents where away I painted the whole kitchen with this product and a few weeks later the room was repainted. Now one year later the paint is coming off the walls again but this time way more easily and falling like dust. I was able to take off a lot of the paint just using a kitchen brush.

Now I'm not sure why. Is it because before painting we didn't wash the walls down again or is it something else?

Original mold
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1727471942910.png


Half and half view while paint this unknown product
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Vs One year later
1727472080519.png


After I brushed the wall and used a scraper
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