Alkali-resistant paint is a type of paint specifically formulated to withstand high alkaline conditions commonly found in masonry surfaces such as concrete, cement render, brickwork, and plaster. These surfaces can contain soluble salts and lime that may react with standard paints, causing issues like blistering, peeling, or discoloration.
Alkali-resistant paints contain special binders and additives that prevent chemical reactions between the paint and the alkaline substrate. This makes them ideal for use on new or unseasoned masonry, especially in exterior applications or damp environments.
In Australia, alkali-resistant paints are often used as a primer or sealer before applying topcoats, particularly in construction and renovation projects involving concrete or cement-based surfaces.