Environmentally friendly, this two-part chemically setting caulk is recommended for use inside the nose of all rubber and vinyl stair treads. Additionally, it can be used to fill voids on worn or broken steps to provide support. Spread Rate: 1/2 in. bead of approx 40 lin. ft. per two part quart unit, 1/4 in. bead of approx. 50 lin. ft. per dual cartridge. California Warning P65