Crack & Joint Sealant-1/2 Gallon Unique, Breathable, Silicone Sealant Used To Repair Exterior Cracks and Prevent Leaks on Chimneys, Brick Walls and Between Concrete or Stone Masonry Units Brush-able Sealant for Waterproofing Mortar and Brick Available in 1/2 Gallon Container Including Two (2) Brushes: 1" Brush for Vertical Joints and 4" Brush for Horizontal Joints