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How to Paint Over Mould

Black mould growth and staining on interior walls and ceilings is a common problem for many properties. Landlords especially can struggle to keep the problem at bay when tenants fail to ventilate the affected areas adequately. Any room can be affected when high levels of moisture are able to linger for long periods of time and once the mould beings to show it can be difficult to stop the spread. Not only is it unsightly but it can also be a serious health issue that should be avoided wherever possible. Zinsser Perma-White blocks fungal degradation permanently as well as providing a decorative finish that can be produced in almost any colour and lasts for years.

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Surface Preparation
All surfaces must be clean, dry and free from anything that will interfere with the adhesion of the materials to be applied. Remove loose and failing material by scraping or brushing with a stiff bristle brush to a sound edge. Feather sound edges with a fine grade abrasive paper. Remove all visible signs of organic growth and treat the areas with Zinsser Mould Killer & Remover in accordance with the manufacturer’s instructions. Allow to dry.

In areas with remaining sound paint wash with hot water and liquid detergent solution to remove any contaminants, frequently changing the water. Rinse thoroughly with clean water to remove all residues. Allow to dry. Fill any cracks and small surface defects with Zinsser Ready Patch or Zinsser Ready Patch Lite as appropriate in accordance with the manufacturer’s instructions. Allow to dry. Rub down with a fine grade abrasive paper. Remove all dust.

Patch Priming
Patch prime all stained, bare and filled areas with one coat of Zinsser B-I-N Primer Sealer in accordance with the manufacturer’s instructions. Allow a minimum drying time of 45 minutes in normal drying conditions.

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Decoration
Decorate with two full coats of Zinsser Perma-White Interior Eggshell, Satin or Semi-Gloss in accordance with the manufacturer’s instructions. Allow a minimum drying time of two hours between coats.

Zinsser Perma-White is a durable, water-based, very low odour finish containing a biocode that protects the dried coating against mould and mildew and is guaranteed for 5 years. It is ideally suited for any area of persistent high humidity, frequent temperature changes and poor air circulation. For more information or to speak to us about your project do not hesitate to get in touch.

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