Everbuild Black Jack 903 Bitumen Trowel Mastic is a trowel-applied, black, heavily-filled bituminous compound with added fibres for reinforcement. The product forms a surface skin, but the mass below remains soft to allow for moderate movement. Suitable for sealing and filling holes in mastic asphalt, roofing felt, corrugated iron, metal guttering and downpipes.

Heavily-filled, fibre-reinforced, trowellable bituminous compound
Mainly used for waterproofing, stopping, bedding, bonding and sealing
Adheres to/fills holes in: mastic asphalt, roofing felt, corrugated iron, cast iron, fibre cement, slates, lead, copper, zinc, concrete and timber
Fast drying
Fibre-reinforced
Suitable for use with all bituminous surface coatings
Remains flexible for long periods after application