Black Jack 903 Bitumen Trowel Mastic 2.5 L

Sika Black Jack-903 Bitumen Trowel Mastic is a black, heavily filled, fibre-reinforced bituminous compound designed for trowel application. It forms a surface skin while the mass below remains soft to accommodate moderate movement. It is suitable for sealing and filling holes in mastic asphalt roofing felt, corrugated iron, metal guttering and downpipes, and adheres to and fills holes in materials such as mastic asphalt, roofing felt, corrugated iron, cast iron, fibre cement, slates, lead, copper, zinc, concrete and timber. The product dries quickly, remains flexible for long periods, and is ready to use without thinning. It can be applied with a steel trowel or putty knife and is available in 1-litre, 2.5-litre and 5-litre tins.

Key features

• Fibre reinforced, heavily filled bitumen mastic
• Forms surface skin; soft mass underneath for movement
• Fast drying and skinning in 24 hours
• Remains flexible for long periods
• Ready to use; does not require thinning; apply with trowel or putty knife

Applications

Used for sealing and filling holes in mastic asphalt, roofing felt, corrugated iron, and metal guttering and downpipes. It also serves for waterproofing, stopping, bedding, bonding and sealing applications, adhering to and filling holes in cast iron, fibre cement, slates, lead, copper, zinc, concrete and timber.