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Paint Problems


Resisting Alkali


No alkali resistance: Results are color loss and complete deterioration of the paint on fresh masonry.

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 an 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, page 7.

Primers & exterior finishes: Priming is critical. An alkali-resistant primer must be used on fresh, uncured masonry surfaces. Select a top quality exterior paint in the color and sheen of your choice.