How to Treat Mould Before Painting

treating Mould

Mold…mould…yuck…. No matter what you call it, mould is a point of consternation for anyone undergoing a remodel or renovation. You may think that your newer home is immune to this annoying problem, but unfortunately that is not the case! While older homes may be more susceptible to letting moisture in, resulting in mould growth, newer homes have such tight seals around windows and doors that overall more moisture is held inside the house if not regularly aired out. Essentially, no home is completely safe from mould- so knowing how to treat mould before painting is invaluable knowledge for homeowners.


The Non-Toxic Way to Treat Mould Before Painting

If possible, try to treat the mould on your walls with this non-toxic method first. If the mould returns after a couple of days, move on to the bleach method. We recommend this because bleach can be an irritant to lungs, eyes, and skin. With both of these methods, use rubber gloves to protect your hands.


borax and vinegar

You will need:

2 cups of hot water

2 tablespoons of Borax

¼ cup of white vinegar


Mix these three things together in a spray bottle until the Borax is dissolved. Spray the mixture generously over the painted wall, scrub well and then wipe clean with a damp cloth. Spray again, and this time let the mixture sit for 10 minutes before wiping dry.

The Bleach Method to Treat Mould Before Painting

If the non-toxic mould treatment doesn’t work, move on to the much stronger bleach method:

Mix ¼ cup of bleach to every 2 cups of water in a spray bottle. Liberally spray the affected area, scrub well and then wipe clean. Repeat as with the non-toxic method.


If you use either of these methods on unpainted drywall, be sure to let the wall dry completely before commencing your home painting.

Always consult a professional if the mould returns after using these methods. Academy Plus Painting’s expert team would be happy to consult with you about preparing your walls for painting.


What are your tried and true mould removal methods? Let us know in the comments!


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