The ASI 502 RTV Silicone Sealant is an industrial grade, high performance 100% silicone product. The 502 is a ready to use product that cures with air contact. Sealant skins over in 10 minutes with full cure being obtained in 24 hours. The product can be tooled within the first 10 minutes of application. Confinement of product increases the time requirement for curing. The 502 sealant is not paintable.