Butyl Caulk

Millennium Water Block Mastic is a gray colored, high performance, low VOC, non-curing, permanently flexible gun grade mastic. It maintains a positive seal by remaining flexible and adhered to all approved substrates. All work surfaces should be clean, dry, free of dirt, dust, debris, oils, un-adhered coatings, deteriorated membrane and other contaminants that may result in a surface that is not sound or is uneven.

• Talc, dust, oil, ice, snow, or wet conditions inhibit good adhesion

• Clean and dry surfaces are necessary for proper installation of this product

• Not recommended for direct contact with insulating glass sealants 

• Not to be used in locations exposed to direct UV light 

• Not to be painted 

• Use only in unexposed areas