Hi, so recently I had discovered there are some mold growing on a wall in a room under my stairs, and I tried scrubbing them with some bleach and I managed to get rid of the mold that's visible to my eyes. But as a result of the scrubbing some of the paint on the wall is damaged. So I went to a local paint shop and told the guys over there what happened and asked for some advice on how to repaint the spots, then they told me it's better to remove all the paints in the room and paint it over from the start, because there's a chance that the mold has already spread over to the other walls in the room and they're just not visible yet. So I got me some paint and some other equipment to paint recommended by them (picture of the paints will be attached below)

Now I've done some scraping and sanding but I don't know if I've done enough.

This is how the wall is looking right now.
do I need to keep scraping and sanding until there's only gray from the concrete wall? Or is this good enough for me to start painting? The white stuff on the wall feels flat with the other parts of the wall that's completely gray and they're pretty hard to remove too, even after I applied some paint strippers on them.

Thank you in advance,
Sorry if this is a bit hard to read/understand, because English is not my first language.

 

Mold grows on the surface not in or under the paint so removing paint is not necessary just treating the visible mold!

 

Welcome to the forums John!

You've already done more than enough prep. Mold needs 3 things to grow; heat, moisture and a food source. Increasing ventilation to that area should be enough to prevent reoccurrence. This could be as simple as removing items that restrict the natural airflow.

It wouldn't be a bad idea to paint with a bath paint [has extra mildewcide] Or you could add a mildewcide to the paint. M-1 is the mildewcide I often mix into the paint.