903

Sika® Black Jack®-903 Bitumen Trowel Mastic is a fibre-reinforced, heavily-filled bituminous compound designed for trowel application, forming a durable surface skin while remaining soft beneath to accommodate moderate movement. It is suitable for sealing, waterproofing, filling and bonding on a wide range of materials, including mastic asphalt, roofing felt, corrugated iron, cast iron, fibre cement, slates, lead, copper, zinc, concrete and timber, making it ideal for repairing holes and defects in roofing and guttering systems. Fast-drying and compatible with all bituminous coatings, the pr