Proline 35459 is a type of high-performance silicone sealant manufactured by the company Tremco. It is an all-purpose sealant developed specifically for use on high-strength substrates and provides a weatherproof and durable bond on a variety of materials. It is designed to form a permanent and flexible seal, and it has excellent adhesion qualities. It can be used to seal joints and seams in a variety of materials including glass, metals, many plastics and composites. It will not shrink, crack, or crumble and provides protection from moisture, impacts, and tough weather conditions. It also provides long-term resistance to fungi, mold, and mildew and can be painted when fully cured.