Pecora 890NST is a one-part, neutral-curing, ultra low-modulus silicone sealant that will not stain natural stone like marble and granite. 890 NST reacts with moisture in the atmosphere to form a durable yet flexible building sealant. Pecora 890NST performs quite well under dynamic conditions due to its ultra-low modulus, high extension - compression, recovery properties and strong adhesion to most substrates and accommodates long-term movement of +100-50% in properly designed joints. Harsh weather conditions, including rain, sleet, snow, sunlight, extreme temperatures, high ozone concentrations and/or exposure to intense ultra violet rays have very little effect on the ultimate performance of Pecora 890NST even after years of such exposure. Pecora 890NST is designed primarily for sealing expansion and control joints in precast concrete panels, architechtural and natural stone, metal curtainwalls, perimeter sealing of doors and windows, Exterior Insulation Finish Systems (EIFS) and numerous other areas requiring a high-performance sealant. 890NST adheres quite persistantly to concrete, natural stones, masonry, steel, fluoropolymer painted and powder coated aluminum, wood, vinyl and many other plastics, generally without need for a primer, and performs equally well in new or rehabbed construction.