f you’re wondering how to treat mold on walls before painting, you’ve come to the right place. Mold can be more than just an eyesore; it can also pose a serious health risk. In the Newton and Greater Boston Region, this is a common issue many homeowners face. Before you grab that paintbrush, it’s crucial to deal with any mold problems to ensure a clean, durable paint project.

Why Is Treating Mold Important?

Mold spores are everywhere. When they find a damp, warm environment, they grow. This can not only damage your walls but also cause health issues like allergies and respiratory problems. If you paint over mold, you’re just masking the problem. Eventually, the mold will eat through the paint, and you’ll have to start all over again.

exterior mold and mildew

Identifying the Type of Mold

Before you learn how to treat mold on walls before painting, it’s important to know what type of mold you’re dealing with. The most common types are:

  1. Black Mold: Highly toxic and requires immediate removal.
  2. White Mold: Less harmful but still needs treatment.
  3. Green Mold: Typically found in humid environments and also needs treatment.

Consult experts if you’re unsure about the type of mold in your home.

Materials You Will Need

To treat mold effectively, make sure you have the following:

  1. Gloves
  2. Safety goggles
  3. Mask
  4. Scrubbing brush
  5. Mold-killing solution or a mixture of water and bleach

Step-By-Step Guide on How to Treat Mold on Walls Before Painting

Step 1: Safety First

Wear your gloves, safety goggles, and mask to protect yourself from mold spores. Make sure the room is well-ventilated.

Step 2: Prepare the Wall

Use a scraper to remove loose paint around the moldy area. This will make it easier to treat the mold.

Step 3: Apply Mold-Killing Solution

Apply your chosen mold-killing solution to the affected area. Let it sit for at least 10 minutes to kill the mold spores. House painters in Newton and the Greater Boston Region often use specialized solutions for the best results.

Step 4: Scrub the Area

Using a scrubbing brush, thoroughly scrub the treated areas to remove the mold. If the mold persists, repeat steps 3 and 4.

Step 5: Dry the Wall

Use a towel or a hairdryer to completely dry the area. This is crucial because any remaining moisture can lead to mold recurrence.

Step 6: Prime and Paint

Once the wall is dry, apply a mold-resistant primer. After the primer has dried, you can paint the wall with mold-resistant paint. House painters in Newton and the Greater Boston Region always recommend using high-quality, mold-resistant paints for longevity.

Tips and Precautions

  1. Do a Patch Test: Before applying any solution to a large area, perform a patch test to ensure it doesn’t damage your wall.
  2. Consult Experts: If the mold infestation is severe, it might be best to consult professional house painters in Newton and the Greater Boston Region.


Knowing how to treat mold on walls before painting is essential for the longevity of your paint job and the health of your living space. If you’re feeling overwhelmed by the process, remember that you don’t have to go it alone. Ulta Home has been helping homeowners in Newton and the Greater Boston Region deal with mold and paint their homes to perfection.

Call us today at 978-481-4119 for a mold-free, fresh new look for your home!