Concrete and masonry:
Choose a specialty caulk
A caulk specially formulated for concrete and masonry will outperform general-purpose products. Most concrete and masonry sealants are polyurethane or hybrid formulas. But one acrylic latex product, Slab, also performs well, especially on concrete cracks that move a lot. Some concrete and masonry caulks are selfleveling and can be used only on level surfaces.
From left to right: polyurethane, hybrid and acrylic latex