Polly, a property manager has on old cinderblock building downtown that she would like to get painted and address a water issue coming through the walls.
If mortar contains hairline cracks, use 501901x Masonry Block Filler.
For more information about this or other painting tips & techniques, our paint & coatings products, or general DIY paint and coatings questions, please contact us online or by calling 1-800-452-2315.