Remove mould on dark painted wall?

Question

I just paint my room wall in dark maroon. White patches of mould appeared. Had clean with a damp cloth. It grow back in bigger patches. I even tried painting over the mould. Mould had cover 50% of the painted wall. Help!!!

A concrete wall

It something like an apartment. The affected wall is on 2nd floor.I had check & there is no source of water leak. Nothing on the other side of the wall. I used bleach and now the painted wall have glossy stripes. We have only sun/rain weather here. I trying to air the rm by switching my giant fan 12hrs & opening the window.

Answer 1

You can't just wipe it away or paint over it. It will continue to grow.

Get a good mold killer/primer from your hardware store. Stain-Kilz is a product that is very noxious but very effective. Be SURE to have good ventilation to the outside. You can also get paint that is mold-resistant.

Be aware the mold is growing for a reason, so you need to take steps to remove the cause of the moisture, perhaps by increasing the temperature in the room.

Answer 2

I'm not sure on a couple points, but perhaps the wall is made from cinder block as opposed to concrete? Is the wall an exterior wall on the other side? If the wall is concrete (which would be rare) or cinder block moisture will pass through it's pores. You should try a sealant to prevent the moisture from passing through. If it's an interior wall, then is it below grade, or in a basement? If so, you still have a misture problem, which may be originating from above the wall and seeping down. or the entire area is damp and musty. Any concrete, cinder block, brick mortar layers should be sealed when used indoors.

You could clean the wall extremely well (use amonia instead of bleach, because bleach has an ingredient that actually promotes future growth). Then paint on a good "quality" sealant. Even two or three coats aren't too many. Once it's dried, you can then paint over it. Someone else mentioned there is an additive for paint that's supposed to supress mold growth. I've used it, and unless you take other steps, it doesn't work alone very well.

Good luck

Answer 3

What kind of wall is it? Drywall, concrete?

This may not be mold, does it look like salt stains from sweating while wearing a baseball hat?

Could be efflorescence, a natural occurrence in concrete products. To be safe, spray bleach on the area (wear a mask) and see what that does. If it's mold, the bleach should kill it. If it's not, then you will probably need to seal the concrete prior to painting. You can clean/wash efflorescence, but you won't be able to do it well enough on an inside wall. It is not caused by water, although you should look for signs of water intrusion.

Answer 4

Mold's not easy to stop once it gets going. You have to stop it in its tracks first. Where there's mold there's excess moisture - so solve the water issue. Look for leaks. Resolve high humidity issues. But don't just cover it up with paint. Mold will keep growing.
As for cleaning mold, bleach doesn't work - mold always comes back. Home Depot is selling a new product called Concrobium Mold Control. It dries on the moldy surface to eliminate mold. And then stays on to prevent any future mold growth. And it's non-toxic which is nice. Good luck.

Answer 5

If the room is extremely heat and the water interior the bathroom is extremely chilly, the bathroom will advance condensation around the exterior, particularly throughout showers, etc. Chlorine bleach is appropriate to the best factor for mildew all around. I save a field of bleach wipes in a basket ideal on the tank, and that i supply that section a swipe a pair of situations each week, they're reachable if the guy in the previous you replaced into kinda messy too. additionally a squirt bottle with diluted bleach answer will save it down in case you supply it a squirt now and returned. substitute out that plastic bathe curtain liner approximately each 3 mos, it somewhat is a mildew fest in many situations after that long. mildew is undesirable, i'm deathly allergic to it.

Answer 6

You might have to open up the wall and check for leaks, or other plumbing problems. Open your windows on dry days. You might need a fan to get good ventilation. I hope you dion't live in a humid area.