Everbuild Black Jack® 903 Bitumen Trowel Mastic is a black heavily filled bituminous compound with added fibres for reinforcement that is applied by trowel. It is used primarily for patching holes in roofs and bituminous coatings. The product forms a surface skin but the mass below remains soft to allow for moderate movement.1 x Everbuild Black Jack® 903 Bitumen Trowel Mastic 1 litrePTDEVB90301
