GG200 NonSag « SelfSeal Firestops. SelfSeal® GG200 is a singlecomponent, low modulus, nonslumping silicone firestop sealant designed for horizontal and verticle appliions.It forms a pressure tight seal resistant to water, smoke and toxic gases, see SelfSeal® UL and cUL firestop systems for W (Water tightness) and L