... one-component ; 3.polyurethane building seala construction adhesive CS-a4 is a kind of high-powered,elastic after cured,well-sealed one ... used in bond and sealing of construction material. product performance:1.Single-component,good thixotropy,convenient construction;2.High intensity,tall flexibility,good ... immediately if you hand or skin gum on,not solvents. high quality PU construction adhesive