Yes, waterproofing can be done on already painted walls. But loose paint, peeling layers, and weak plaster should be removed first.

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Can waterproofing be done on already painted walls?
By varad lanke, 7 October, 2024

Damp walls are one of the most common problems in homes, especially during the monsoon or in rooms that stay closed for long hours. A small wet patch may look harmless at first, but it can soon lead to peeling paint, mould, stains, and repeated repair work.

Internal wall waterproofing protects your walls from moisture and keeps your home cleaner, safer, and easier to maintain throughout the year. This highlights the importance of waterproofing in preventing long-term wall damage.