No Alkali resistance
Alkali probable causes - poor surface preparation. Painting a new high alkalinity masonry surface before it has cured a minimum of 30 days. Full curing takes a year. No primer or using improper primer. A top coat of oil base or vinyl latex without a primer.
Alkali solutions - allow new masonry surfaces at least 30 days of curing to avoid color loss and paint film deterioration on fresh masonry. Use an alkali resistant primer. Repainting requires the same preparation as Efflorescence.
Primers and Exterior finishes - Priming is critical. An alkali-resistant primer must be used on fresh, uncured masonry surfaces. Ask your Muralo dealer for the best Muralo exterior paint for your project, in the color and sheen of your choice.