August 27th, 2015

6 Steps for Painting Over Mildew


How to paint over mildew


This is a photo of the back door of my house. Look closely… do you see it?


painting over mildew


…See all that chalky mildew? Yuck-o! It gets on everything outside my house and is visible on white exterior trim. It’s gross—and I can’t just paint over it to get rid of it. I have to clean the mildew off first before painting over the surface.


how to clean mildew off exterior surfaces


Sometimes all a mildewed surface needs is a good cleaning with mildew cleaner to look fresh and new (as shown in the photo above). But I have found that after a few years, painting over mildew is important to make the surface look nice.


supplies needed for painting over mildew


6 Steps for Painting Over Mildew


  • Mildew cleaner
  • Plastic tarps
  • Water hose
  • Scrub brush or rag
  • Paint scraper
  • Paint brush
  • Painter’s tape
  • Exterior Premium paint (I used Ultra White right off the shelf and did not have it custom mixed)


Mildew Cleaner



1. If the surface paint looks old and chippy, use a paint scraper to remove loose or chipped paint.

2. If you are going to be using mildew cleaner around plants or shrubs, protect them with plastic drop cloths before using the cleaner.

3. Spray mildew cleaner directly on the painted surface. The cleaner takes effect immediately. Watch the mildew disappear right before your eyes.


cleaning exterior mildew before painting


4. Use a hose to rinse the cleaner from the surface with water and let the surface dry before painting.

5. Once the surface is dry, check again for any loose or chipped paint. Scrap off to remove. Use painter’s tape to protect areas you don’t want to get paint on.

6. Use an exterior latex paint in a semi-gloss finish, like Glidden Premium Exterior Semi-Gloss. Apply two light coats, letting the first one dry before applying the second. After the second coat is dry, touch up if needed.


Freshly painted exterior trim that had mildew


So long mildew! Hello clean and freshly painted trim.

I have been sponsored by the Glidden® brand paint for PPG to write this post but the thoughts and opinions expressed are my own.