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 5 litre