... Description:ZJ-2000 Weatherproofing Silicone sealant is a one-part,,neutral-cure,architectural grade sealant specifically designed for ... the air to form a excellent,durable,flexible silicone rubber seal.Characteristic:1.can be used ... ,ozone or temperature extremes. 5.low modulus sealant 6.extension/compreession movvement capability of up to ... without primmer. ZJ-2000 Weatherproofing Silicone Sealant