Products / WeatherBond X-Tenda Coat XTRA Butter Grade Mastic

A 100% silicone, moisture-curing, solvent-free roof mastic used for repairs to metal, smooth BUR, smooth and granulated modified bitumen, aged single-ply, flashings, fasteners and drains. Butter Grade is brush or trowel applied up to 1/4 inch and ships in 2 gallon pails; Fiber Grade is a fibrated version with polyethylene fibers for trowel application up to 1/2 inch around drains and rooftop equipment. Both bulletins list coverage of 12 square feet per gallon at 1/8 inch and report tensile strength by ASTM D412; the Fiber Grade bulletin lists a maximum VOC of 25 g/L.