How To Paint a Mold-Resistant Bathroom

Bathrooms are prone to moisture and humidity, making them susceptible to mold and mildew growth. Painting your bathroom with mold-resistant paint can help prevent these issues and keep your space looking fresh. In the video above, This Old House expert Mauro Henrique demonstrates the proper techniques for painting to achieve a long-lasting, mold-resistant finish.

Choosing the Right Paint

When choosing a paint, opt for formulas specifically designed to resist mold and mildew. These contain antimicrobial additives that inhibit fungi and bacterial growth on the painted surface, helping your bathroom walls last longer and reducing potential allergens.

Finish Options

You can choose from several finishes when painting your bathroom:

• Eggshell: This has a subtle sheen that offers a balance between a flat and shiny finish.
• Semi-gloss: More durable and moisture-resistant than eggshell, semi-gloss is suitable for areas with high humidity.
• Gloss: The most durable and easiest to clean, gloss finishes are perfect for trim and high-moisture areas. This finish reflects light, which can make smaller bathrooms feel more expansive.

Color Selection

The color you choose comes down to personal preference, but consider the following factors:

• Light colors can make small bathrooms feel more spacious, enhancing natural and artificial light.
• Darker shades can add depth and warmth to larger bathrooms, giving them a cozy ambiance.
• Neutral tones are versatile and timeless, matching various decor styles and accessories.

For the bathroom in the video, Henrique chose Behr Marquee interior paint in Gray Shimmer with an eggshell finish. He applied two coats to ensure even coverage.

Gathering Tools and Materials for Your Painting Project

The materials Henrique used for this job can all be found at home centers if you don’t already have them on hand. Here’s what you’ll need:

Antimicrobial paint
Painters tape
220 grit sandpaper
Masks
Rags
Bucket
Roller tray

Preparing the Bathroom for Painting

Follow these steps to make sure your bathroom is ready for its new coat of paint:

1. Remove all items from the bathroom, including towels, rugs, and decorative objects. Clearing the space reduces the risk of accidental spills and mess.
2. Clean the walls thoroughly with a mild detergent solution to remove any dirt, grime, or soap scum. Clean surfaces make for better paint adhesion.
3. Repair any cracks, holes, or imperfections in the walls using spackling compound or joint compound.
4. Sand the repaired areas smooth once dry. In the video, Mauro uses 220-grit sandpaper. Even textures allow for even paint application.
5. Wipe down the walls with a damp cloth to remove any sanding dust. 
6. Allow the walls to dry completely before proceeding. Wet surfaces could cause the paint to bubble or peel.

Addressing Existing Mold

Address any mold on your bathroom walls before painting:

1. Create a solution of water and bleach (1/3 cup of bleach per 1 gallon of water).
2. Using a damp rag, gently wipe the affected areas with the solution. This avoids spreading spores into the air.
3. Allow the surface to dry completely before painting. Moisture can prevent paint from adhering properly.

Henrique cautions against spraying cleaning solutions directly onto painted walls, as this can damage the paint. Instead, always apply the cleaning solution to a rag first. 

Applying Mold-Resistant Paint

Now that your bathroom is prepped and ready, it’s time to start painting. Follow these steps for the best results:

1. Use painter’s tape to protect any tile, trim, or fixtures that you don’t want to paint. 
2. Apply a coat of mold-resistant primer for better paint adhesion and coverage. Primer creates a base that seals the surface.
3. Allow the primer to dry completely according to the manufacturer’s instructions.
4. Begin painting with your mold-resistant paint. Cut in around the edges of the walls using a high-quality angled brush. These brushes reach into corners and edges with precision.
5. Use a roller to apply the paint to the larger wall areas, working in small sections. Rollers cover large surfaces evenly and smoothly.
6. Allow the first coat to dry completely, usually one to three hours. Check the label on your painter for the manufacturer’s suggested time.
7. Apply a second coat for even coverage and maximum mold resistance. 

In the video, Henrique demonstrates proper cutting-in techniques and how to achieve smooth, even coverage with a roller. Attention to detail is key here.

Tips for a Professional Finish

Follow these tips for a professional-looking paint finish:

• Use long, smooth strokes with the roller to minimize visible lines and texture. 
• Work in small sections to maintain a wet edge and avoid lap marks. Keeping a wet edge prevents unsightly overlaps.
• Pay extra attention to corners and edges. These areas are prone to thin coverage.
• Allow adequate drying time between coats for the best results. Patience pays off with a durable, clean finish.

Maintaining Your Mold-Resistant Bathroom

Here are some tips to help prevent mold growth and maintain your newly painted bathroom.

Ventilation

Proper ventilation is crucial for preventing moisture buildup that can lead to mold growth. We recommend using a bathroom fan and following these best practices:

• Run the exhaust fan during showers and for at least 30 minutes afterward. 
• Keep the bathroom door open when possible to improve air circulation and reduce humidity levels.
• Consider installing a timer switch for your exhaust fan to make sure it runs for enough time.

Regular Cleaning

Clean your bathroom regularly to prevent mold. Here are some guidelines:

• Wipe down shower walls and curtains after use to remove excess moisture. 
• Clean the bathroom regularly with mold-inhibiting cleaners. 
• Pay special attention to areas prone to moisture accumulation, such as corners and crevices. 

Addressing Minor Mold Issues

If you notice small areas of mold starting to form, mix a small amount of bleach with water in a container. Dip a rag into the solution and gently wipe the affected area. Avoid scrubbing aggressively so you don’t damage the paint. This method can effectively remove small mold spots without harming your newly painted walls. 

Long-Term Care

Take these additional steps to ensure your paint job lasts:

• Inspect the bathroom regularly for signs of mold or mildew. 
• Reapply a top coat of mold-resistant paint every few years. 
• Maintain plumbing fixtures to prevent leaks.