Answer: If you want to paint the fireplace brick, you can use ProClassic, but the brick should be primed with a masonry primer. Sherwin Williams sells a product called Loxon Concrete and Masonry primer. You might also consider using ProClassic water-based acrylic-alkyd (hybrid) instead of the regular acrylic version.

Does Sherwin Williams Pro Classic need primer?

And although Sherwin Williams ProClassic is known to have a higher level of adhesion than most paints, it does not include a built-in primer. ... You should apply multiple coats of primer with time to dry in between each layer.

How long does ProClassic take to cure?

All new surfaces must be cured according to the supplier's recommendations— usually about 30 days. Remove all form release and curing agents. Rough sur- faces can be filled to provide a smooth surface.