A masonry wall showing signs of high alkalinity should be painted with which type of paint?

A masonry wall showing signs of high alkalinity should be painted with which type of paint?

• A. Water repellent paint
• B. alkalyd paint
• C. alkalyd resistant paint
• D. epoxy paint

Answer: (C)

High alkalinity in masonry creates a caustic surface that can attack many paint binders, causing adhesion loss and premature failure. To withstand those alkaline conditions, you need a coating formulated to resist alkalis. An alkyd-resistant paint is designed for exactly this scenario, using a resin system that holds up when exposed to high pH, so it will adhere properly and maintain its finish on a cement-rich wall. Water-repellent paints don’t address the chemical attack, plain alkyd paints are prone to degradation in strong alkali, and while epoxy can be alkali-resistant, the option specifically described as alkyd-resistant directly targets alkali resistance, making it the best fit.

High alkalinity in masonry creates a caustic surface that can attack many paint binders, causing adhesion loss and premature failure. To withstand those alkaline conditions, you need a coating formulated to resist alkalis. An alkyd-resistant paint is designed for exactly this scenario, using a resin system that holds up when exposed to high pH, so it will adhere properly and maintain its finish on a cement-rich wall. Water-repellent paints don’t address the chemical attack, plain alkyd paints are prone to degradation in strong alkali, and while epoxy can be alkali-resistant, the option specifically described as alkyd-resistant directly targets alkali resistance, making it the best fit.