Poor alkali resistance
Poor alkali resistance is the loss of colour and overall deterioration of paint film on fresh masonry.
Possible Cause
Poor alkali resistance is the loss of colour and overall deterioration of paint film on fresh masonry.
It occurs when oil-based paint is applied to new masonry that has not fully cured (at least one year). Fresh masonry contains lime and cement, which are very alkaline. Until the lime has a chance to react with carbon dioxide from the air, the alkalinity of the masonry remains so high that it can compromise of the paint film performance.
Solution
Always allow fresh masonry surfaces to cure for a minimum of 30 days, ideally for a full year, before painting. If this is not possible, apply a quality, alkali-resistant sealer or water-based primer. Using Dulux 1 Step Acrylic Primer, Sealer and Undercoat followed by Dulux Weathershield is recommended.
Help & Advice
Our expert support team can help with everything from choosing colour, what product is the most appropriate for your job or troubleshooting when something hasn’t gone your way.
Book an in-home consultation with a Dulux designer who will help you find the right colour scheme for your home, considering your furniture and lighting.
