A. On new stucco, I recommend a chlorinated rubber paint developed specifically for use on concrete and stucco. Pratt & Lambert Alka-Tite is one such product. On weathered stucco where much of the alkali has washed off, a primer such as Sherwin Williams Masonry Conditioner (diluted with an equal volume of paint thinner), followed with two coats of exterior latex paint seems to work well.

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