Painting brick, for the most part, is entirely doable—and can give your old fireplace or brick house an easy face-lift. But you’ll want to plan carefully and do your research first. Painting brick isn’t like painting any old surface.
First up, you should know that not all brick should be painted.
Rick Watson, director of product development at Sherwin-Williams, recommends against painting brand-new, porous brick. Instead he advises opting for at least a year to pass so the brick can weather. This will also allow for leaching, a process in which alkali (mortar) and efflorescence (the white powder you sometimes spot on brick) have time to leach out of the brick before painting.
And while you can paint the outside of a fireplace, it is typically not recommended that you paint the brick inside a masonry fireplace, he says, as there is no guarantee the finish will withstand contact with open flames from a fire.