NuSil Technology LLC:  FS-3502-1 is a two-part, white fluorosilicone gel available in an easy-to-use 1:1 mix ratio. It bonds aggressively with most surfaces, and its cure can be heat-accelerated. It is hydrocarbon resistant for components exposed to chemicals and solvents, and it exhibits low modulus and absorbs stresses incurred during thermal cycling.
Call 805/684.8780.