Elena Rossi
Painting over mould is not a good idea. While it may cover the visual presence of mould, the mould will continue to spread and reappear through the paint. Therefore, it is important to first kill the mould with a mould-killing chemical or a mixture of vinegar and water, before applying a mould-resistant primer and paint. Such paints contain antimicrobial additives, like fungicides and biocides, designed to prevent mould or mildew on the surface. Benjamin Moore’s Aura Bath and Spa, for example, is a mould-resistant paint that can be used in bathrooms and kitchens.
| Characteristics | Values |
|---|---|
| Paint type | Mold-resistant paint, Lime paint, Waterborne Ceiling Paint, Kitchen & Bath, Element Guard, Zinsser Perma White, Benjamin Moore Aura Bath & Spa, Behr Premium Plus Ultra, Vista Paint’s All Star |
| Paint ingredients | Fungicide, antimicrobial additives, biocides |
| Paint finish | Semi-gloss, flat, satin, eggshell, ultra flat, matte |
| Paint colour | Wide colour selection |
| Odour | Low odour |
| Volatile organic compounds (VOCs) | Low VOC, zero VOC |
| Application | Self-priming, easy and smooth to apply |
| Durability | Durable, high coverage, excellent coverage |
| Other | Stain blocking, mould resistant, mildew resistant |
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What You'll Learn
Mould-resistant paint can prevent mould growth but not kill it
Mould-resistant paint is designed to prevent mould growth by inhibiting the growth of mould and mildew. These paints contain antimicrobial additives, such as fungicides and biocides, which create a protective barrier against mould spores and moisture. They are often used in areas with high humidity, such as bathrooms, kitchens, and basements, to prevent or reduce mould infestations. However, it's important to note that mould-resistant paint does not kill existing mould. Painting over mould will not eliminate it; instead, it will continue to spread under the paint. Therefore, it is crucial to properly remove mould before applying mould-resistant paint.
The market offers various mould-resistant paint options, such as Suretherm Anti-Condensation Paint and Zinsser Mould Resistant Paint, which can be coloured to match specific shades. Benjamin Moore's Aura Bath and Spa is another highly recommended mould-resistant paint known for its high coverage, wide colour selection, and low odour. Waterborne Ceiling Paint is also suitable for ceilings with a history of mould growth. For interior spaces requiring extra protection from humidity and mould, Kitchen & Bath paint is a self-priming option with antimicrobial additives.
While mould-resistant paint can help prevent mould growth, it is not a cure-all solution. Proper ventilation, addressing moisture sources, and maintaining clean and dry surfaces are crucial for effectively managing mould. Additionally, the effectiveness of mould-resistant paint can vary depending on factors such as application methods, surface compatibility, and environmental conditions.
Before applying mould-resistant paint, it is essential to prepare the surface thoroughly. This includes cleaning, scraping, or brushing away any loose or failing paint and removing visible mould with suitable cleaning solutions. Taking the time to ensure proper surface preparation will contribute to the success of the painting project.
In summary, mould-resistant paint serves as a preventive measure against mould growth by inhibiting its development. While it cannot kill existing mould, it can be a valuable tool when combined with proper mould removal techniques and maintenance practices to create mould-resistant environments.
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Use anti-mould primer to prevent mould growth
If you're looking to prevent mould growth, anti-mould primers are a great option. Anti-mould primers are designed to be used in areas with high levels of moisture or in places prone to condensation, such as bathrooms and kitchens. They can be applied to walls, ceilings, metal, plastic, and wood before applying a top coat of paint.
One recommended anti-mould primer is the Zinsser Cover Stain Primer, a fast-drying primer that can be used on a variety of surfaces to permanently seal and block stains. Another option is the KILZ MOLD & MILDEW Primer, which creates a resistant film to protect against mould and mildew growth and can block medium to heavy stains.
When using an anti-mould primer, it's important to properly prepare the surface. Ensure that all surfaces are clean, dry, and free from dust, grease, or peeling paint. If necessary, wash the surface with a non-soapy detergent, rinse well, and allow it to dry completely before applying the primer.
After applying the anti-mould primer, you can follow up with a top coat of paint. Some anti-mould primers, like Zinsser Perma-White, can also be used as a top coat. This paint contains a biocide to protect against fungal degradation and comes with a lifetime durability guarantee.
In addition to anti-mould primers and paints, it's important to address the underlying causes of mould growth, such as inadequate ventilation or external sources of moisture. Improving ventilation, fixing leaks, and repairing damaged walls can help prevent mould from growing in the first place.
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Bleach and vinegar can be used to kill mould before painting
On the other hand, vinegar is an effective, natural alternative for killing mould on both porous and non-porous surfaces. Its mild acidity (5% acetic acid) disrupts mould growth and prevents recurrence. Distilled white vinegar can be sprayed directly onto affected areas, left for an hour, and then wiped clean. For extra potency, vinegar can be combined with borax, a naturally occurring mineral that kills mould and prevents new mould growth by leaving a residue on the surface. To use this combination, mix one cup of borax with a gallon of water and add vinegar, then scrub the surface and allow it to dry without rinsing.
After treating mould with either bleach or vinegar, it is important to address any underlying moisture issues and improve ventilation to prevent mould from returning. Once the surface is thoroughly dry, it can be primed with a mould-resistant or stain-blocking primer before applying a high-quality, mould-resistant paint.
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Mould-resistant paints are ideal for high-humidity environments
Mould-resistant paints are designed to prevent mould and mildew growth on walls. They are ideal for high-humidity environments, such as bathrooms, kitchens, basements, and exterior walls in moist climates. These areas are prone to mould and mildew issues due to the constant presence of heat, steam, and water.
Mould-resistant paints contain fungicide agents that make it difficult for moisture-seeking mould and mildew to grow and spread. They are often self-priming, eliminating the need for a separate primer coat. These paints are available in oil-based and water-based formulas, with some brands offering a wide range of colour options.
Benjamin Moore's Aura Bath and Spa is a recommended mould-resistant paint with high coverage, low odour, and zero VOCs. It is suitable for both residential and commercial settings. For ceilings with a history of mould growth, Waterborne Ceiling Paint is a good option. It offers excellent coverage and comes in over 3,500 colours.
For kitchens, Kitchen & Bath paint is an excellent choice as it resists mildew growth and is easy to apply. It has low VOC levels and retains its colour well over time. Element Guard is another mould-resistant paint designed for exterior walls in humid environments. It provides protection from wind-driven rain and harsh weather conditions.
In addition to mould-resistant paint, proper ventilation and exhaust fans are crucial to preventing mould growth. It is also recommended to use a mould-resistant primer for an extra layer of protection.
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Proper ventilation and humidity control can prevent mould growth
While there are paints available that contain antimicrobial additives and fungicides to inhibit mould growth, proper ventilation and humidity control are key to preventing mould from growing in the first place.
Mould is a fungus that can grow and survive almost anywhere, both indoors and outdoors. It thrives in damp settings, making homes with high moisture levels an ideal environment for mould to grow. Mould spores can travel through the air, spreading and growing throughout a space. Therefore, it is important to ensure your home has good indoor humidity levels and proper humidity regulation to prevent moisture build-up. The ideal indoor humidity range falls between 30% and 60%, and if levels exceed 60%, the air can create enough moisture to enable mould growth.
One way to regulate humidity is through the use of a dehumidifier. A whole-home dehumidifier is a great long-term investment to ensure that corners, cracks, and crevices of your home don't become a breeding ground for mould. Additionally, a complete house ventilation system, such as a Positive Input Ventilation System (PIV), can help prevent condensation build-up throughout the home. These systems use a centralised pump to facilitate airflow, preventing condensation and reducing the chances of mould growth.
In addition to proper ventilation and humidity control, it is important to control moisture by promptly repairing any leaks or water damage, ensuring proper drainage, and maintaining the heating and cooling systems according to the manufacturer's recommendations. By implementing these measures, you can effectively prevent mould growth and protect your home and health.
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Frequently asked questions
No, painting over mould will not get rid of it. The paint will simply cover the mould, but it will keep growing and eventually reappear through the paint.
You can use bleach, vinegar, or a mould-killing chemical to remove mould. You can also use a 10% Borax solution, or Concrobium fungicide spray.
Mould-resistant paint is formulated with antimicrobial agents that inhibit the growth of mould, mildew, and bacteria. It is often used in areas with high humidity, such as bathrooms and kitchens.
Yes, some mould-resistant paint options include Benjamin Moore's Aura Bath and Spa, Waterborne Ceiling Paint, Kitchen & Bath, and Element Guard.
In addition to using mould-resistant paint, you should address the root cause of the mould. This may include fixing plumbing issues, improving ventilation, or using dehumidifiers. Regular maintenance and monitoring for signs of moisture or mould are also important for long-term prevention.
