ALCO-FLEX NEUTRAL SILICONE is a versatile, high quality, low modulus neutral curing silicone sealant with excellent adhesion to a wide variety of substrates. It provides a durable, flexible, watertight seal ideal for internal and external sealing applications, waterproofing and weatherproofing in and around the construction site and home. Its high quality formulation is non-corrosive to metals and glass and suitable for use on alkaline surfaces such as concrete, cement, brick and plaster. It is flexible, allowing for up to 50% movement accommodation making it great for expansion joints.