Poor Alkali Resistence

Poor Alkali Resistence

Color loss and overall deterioration of paint film on fresh masonry.

Possible Causes
Oil-based paint or vinyl acrylic latex paint was applied to new masonry
that has not cured for a full year. Fresh masonry is likely to contain lime
which is 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 attack the integrity of the paint film.

Solution
Allow masonry surfaces to cure for at least 30 days, and ideally for a full year, before painting. If this is
not possible, the painter should apply a quality, alkali-resistance sealer or latex primer, followed by a top
quality 100 percent acrylic latex exterior paint. The acr