Interior – Mould
If you’ve noticed black, grey or brown areas on your painted surface, chances are you’re dealing with a mould problem.
As with mould anywhere, interior mould is caused by moisture. It’s often found on areas that are damp, and receive little natural light and are poorly ventilated (bathrooms, kitchens and laundries). Mould is more likely to occur after use of a lower quality paint, failure to prime bare wood before painting, or if you’ve painted over a coating of mould without removing it.
How to fix it:
First, test for mould by applying a few drops of household bleach to the discolored area.If it disappears, it is probably mildew. Remove it by scrubbing with a diluted household bleach solution (one part bleach, three parts water). Be sure to wear rubber gloves and eye protection. Power washing is also an option. Then, rinse thoroughly, prime any bare timber and apply one or two coats of a top quality paint like Diamond Ace Matt Finish. If possible, install an exhaust fan to help prevent re-growth.