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According to the Brick Industry Association, most bricks are neutral, but mortar often has a basic alkalinity. Paint products can be affected, so alkaline-resistant primer is usually recommended. Remove the efflorescence with water and a stiff brush before painting your brick, and wait to see if it returns.
Considering this, is painting brick a good idea?
Painting exterior brick can certainly be beneficial, but it's also a task that comes with some important considerations. Painted brick is permanent. The good news is that you can change the paint color as often as you'd like, so you don't have to be married to one hue forever. Moisture can cause paint to chip.
Secondly, what kind of paint do you use on brick?
For interior and exterior brick, many experts recommend semi-gloss or gloss paint, as either type accentuates detail and, compared with other paints, is easier to clean as time goes by.
three to five years