Tuff-Stuff MS is a moisture-curing, single-component, non-sag sealant that contains no solvents. When cured, Tuff-Stuff MS offers the performance of a two-part sealant with the ease of installation associated with a one-part. It is designed to maintain an effective bond and seal between materials of similar and dissimilar surfaces, porosities, and expansion coefficients. Tuff-Stuff MS is designed for reglets, precast panels, tilt-up walls, metal curtain walls, copings, window and door perimeters, panel bedding, and glazing details.