Clean and dry surface thoroughly, removing all dirt, dust, chalk, rust, grease, wax and mildew. Patch all cracks with appropriate patching compound. If powdery dust or efflorescence is present, remove it and repair the source of water entry (cracked parapet cap tiles, open joints, cracks, etc.) before painting.
Concrete Block/Cinder Block
Fill pores of bare concrete block with latex block filler, then top coat. Block filler must always be top coated for exterior uses.
Must be clean, dry, thoroughly cured and in good condition. Soft concrete or masonry surfaces should be primed with this product.