Mould is a common problem in New Zealand homes – and it’s something most painters will encounter in their careers. As well as being hazardous to health, mould can cause unpleasant smells and stains, and can quickly ruin a fresh paint job. Here are some tips for trade painters on how to deal with mould and ensure a lasting paint finish.
What is mould and how is it harmful
Mould is a type of fungus that is caused by excess moisture. It is most commonly found in cool, damp conditions and areas with poor ventilation such as bathrooms, kitchens and laundries.
If left untreated, mould can release toxic spores and vapours into the air, which can lead to a range of respiratory problems. Symptoms may include sneezing, a runny nose, red eyes and skin rashes. In some cases, it can also trigger asthma attacks and allergic reactions.
What should I do if I find mould?
If you discover mould at a job site, it’s important to alert the property owner and ensure they understand the implications. Depending on the severity, the property owner may ask for your support to remove the mould, or they may opt to remove it themselves.
When dealing with mould, always wear appropriate personal protective equipment, including a mask, gloves and goggles. If there is significant mould in multiple locations, it may be more appropriate to advise the property owner to engage a mould removal specialist.
Can I paint over mould?
While painting over mould may temporarily disguise the problem, paint alone will not kill mould. Instead, the mould will continue to grow underneath the paint until it begins to show through. It may also cause the paint to bubble or flake, ruining the finish.
If possible, it’s best to remove the mould before painting. However, always worth discussing the matter with the property owner first so that you can proceed in line with their wishes.
What products can I use to treat mould?
For fast and efficient mould removal, we recommend Selleys Rapid Mould Killer, a sodium hypochlorite-based formula which acts in as little as 30 seconds and is suitable for both indoor and outdoor use.
Once treated, clean the area with Selleys Original Sugar Soap to ensure there is no remaining residue, and allow to air dry.
What products help to prevent mould?
Mould is more likely to occur if you paint over bare wood without priming it, so it's important to always use a quality paint primer. It's also worth advising your customers to consider installing an exhaust fan to help improve airflow.
If you are working in a mould-prone region or in a property that has previously been affected by mould, it’s a good idea to talk to your customer about the options available. Suitable products include:
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