silco rtv-7500 multi-surface silicone sealant - neutral cure - clear 2.8oz sil-flex multi-surface 1-part industrial/construction grade silicone sealantsil-flex (rtv 7500) is a one component, low modulus, neutral cure silicone sealant and adhesive created to bond a wide variety of building materials. when fully cured, this unique voc compliant formula offers uv stability and tenacious adhesion to pvc, concrete, glass, aluminum, painted surfaces, wood, plywood, stucco, building paper, window wrap, fiber cement, brick, stone, steel, ceramic, porcelain, masonry, plus many other common material surfaces. this product is specifically formulated to offer all weather performance to meet today's green building standards. skin time approximately 12 minutes, tack free in 25 minutes, and normal curing in 30 hours. length of time for full cure depends upon thickness of application and otther factors including temperature and humidity