Sto Flexible Crack Filler

Sto Flexible Crack Filler is an acrylic-based, non-sag crack filler for sealing and weatherproofing cracks. Use it to fill hairline cracks in vertical concrete, stucco or masonry block surfaces. Its convenient cartridge packaging provides a fast way to fill cracks, up to 1?8 inch (3.2 mm) wide.