Term: alkali-resistant paint

Alkali-resistant paint is a type of coating specifically formulated to withstand the high pH levels found in alkaline surfaces, such as fresh concrete, cement render, brickwork, and masonry. These surfaces can contain free lime or other alkaline substances that may react with standard paints, causing issues like blistering, peeling, or discoloration.

Alkali-resistant paints are commonly used as primers or topcoats in construction and painting projects where the substrate has not fully cured or where high alkalinity is expected. They are particularly important in exterior applications or in new builds where cement-based materials are still curing.

In Australia, using alkali-resistant paint is a best practice when painting over masonry or concrete surfaces, especially in compliance with AS/NZS 2311:2017 (Guide to the painting of buildings), which outlines surface preparation and appropriate coating systems.