Alkali Resistance - Causes & Solutions

Alkali resistance is the ability of any paint or plastic material to resist the effects of an alkali substance, such as lime, cement, plaster, soap and aqueous alkaline solutions. Paint alkali resistance causes a reduction in brightness of color and a comprehensive degeneration in the paint surface on new masonry.

Causes

It is necessary to cure new masonry for a period of one year prior to painting with oil-based or vinyl acrylic latex paint. When a highly alkaline porous or concrete surface is not properly cured for the requisite period, there is poor alkali resistance. Fresh and unused masonry usually contains lime which is very alkaline in nature. This lime component must have the opportunity to react to the carbon dioxide from the air, otherwise this alkalinity remains in the masonry. The untreated alkalinity then launches an attack on the paint surface thereby ruining the color and the durability.

The effects of poor alkali resistance

Poor alkali resistance usually has a direct impact on the color of the paint applied to the surface. The color fades and appears blotched due to the alkalinity. The surface deteriorates rapidly with corrosive effect, and the appearance changes for the worse.

Solutions

The masonry surface, whether concrete, stucco or mortar, must receive a treatment that cures the alkalinity. This curing process takes a minimum of 30 days, although one year is the ideal curing period. If this is not possible for some reason, apply a quality, alkali-resistant sealer or latex primer before painting. The next step is to apply the best, 100% acrylic latex exterior paint over the primer or sealer. This kind of paint contains an acrylic binder that is resistant to alkali attack.

Poor alkali resistance is a problem that is solved with a proper understanding of the painting process and needs. Curing of the surface, selection of a very good acrylic paint and following the right process can eliminate this problem.

Primers and 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.

Substrates, Primers

Substrate: Masonry
Primer: 247 Chem-Guard Acrylic Primer
Finish Coats: 1240 Acry-Shield Exterior Flat Finish
1245 Acry-Velvet Ext. Low Sheen Finish
1235 Seasons Ext. 100% Acrylic Flat
1236 Seasons Ext. 100% Acrylic Low Sheen

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