Black, grey or brown areas of fungus growth on surface of coating. Can also include Red, Yellow and Green Algae.
Possible Causes
Damp areas receiving little or no sunlight are susceptible to mould.
Painting over an area that has had mould.
Low quality paint containing no or low levels of in can biocides.
Reusing opened containers that have received contamination from application transfer and or storage conditions.
How Can I Fix This Problem
Determine firstly if the contaminant isdirt or mildew by applying a few drops of house hold bleach, if the discolored areas disappear, it’s most likely mould.
Remove source of moisture by fixing the leak source, sealing or ventilation.
Apply biocide/sterilizer and or mildew cide as per manufacturer’s instructions. Then scrub and rinse thoroughly.
Recoat with paint that is protected with dry film biocide.
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