- Q.What is the best primer and
paint for an unpainted stucco exterior?
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.