Silicone Sealants are extremely popular materials designed to prevent liquid and contaminant migration from one area to another. They come in a variety of forms and differ by cure mechanism (acetify, oxide, alloy, reactive hot melt), viscosity, color, and other properties. Silicone sealants are relatively flexible and can absorb shock and expansion differences between substrates. They are stable and maintain their properties over a wide temperature range. Depending on the formulation, surface priming may be recommended.