Before painting, determine the source of the mould, is it due to condensation, leaks, or poor ventilation? Addressing the root cause is crucial to prevent future mould growth.

Step 1 - Use a scraper to remove any loose, flaking paint affected by mould. Rake out any cracks, and feather any paint edges with a fine grade sandpaper to make smooth.

Step 2 - Wash the area with a solution of warm water and detergent, or for more stubborn mould, you can use a diluted bleach solution (1 part bleach to 10 parts water). Allow to dry, then treat any remaining mould with a specialist mould killer or fungicidal wash. Allow to dry fully.

Step 3 - Make any necessary repairs. Fill any cracks and small surface defects with a suitable plaster filler. If the old paint has been stripped back to bare plaster in patches, a fine surface filler can be used to even the surface before painting. Allow all fillers to dry fully, before sanding smooth and removing any surface dust.

Step 4 - Once the surface has been fully prepared, prime with one full coat of mould resistant primer such as Zinsser B-I-N®, or blockade to seal the area and prevent future mould growth. This primer creates a barrier and helps the topcoat adhere better.

Step 5 - Apply two full coats of a quality anti-mould paint, allowing adequate drying time between coats. Follow the paint manufacturers instructions for application.

Additional Tips:

Ventilation - Improve ventilation in the affected area to reduce moisture build up. Use extractor fans in bathrooms and kitchens.

Regular Cleaning - Regularly clean mould-prone areas to prevent future growth. Use a mould killer on the first sight of mould.

Professional help - If you are unsure about the painting process, consider hiring a professional decorator. They have the experience and tools to handle the job effectively.

If the mould is severe or persistent, consult a professional mould remediation specialist.

Important considerations:

Safety - Always wear protective gear like gloves, masks, and eye protection when working with mould and cleaning solutions.

Ventilation - Ensure proper ventilation during the cleaning and painting process.