This Black Jack (903) Bitumen Trowel Mastic is a versatile solution for efficient sealing and filling across various surfaces. This trowel-applied product boasts a black, heavily-filled bituminous compound fortified with fibres for added reinforcement. While it forms a durable...Read More
This Black Jack (903) Bitumen Trowel Mastic is a versatile solution for efficient sealing and filling across various surfaces. This trowel-applied product boasts a black, heavily-filled bituminous compound fortified with fibres for added reinforcement. While it forms a durable surface skin, the mass beneath retains flexibility, accommodating moderate movements with ease.
With a straightforward application process, this Black Jack Bitumen Mastic is ready to use with no thinning required. From waterproofing and stopping to bedding, bonding and sealing, it is perfect for addressing cracks and holes in mastic asphalt, roofing felt, corrugated iron, metal guttering and downpipes. It also adheres to cast iron, fibre cement, slates, lead, copper, zinc, concrete and timber. With a coverage of 3 litres per square metre at a 2mm wet thickness and a drying time of 24 hours to develop a skin surface, it offers a reliable solution.
Simply apply it with a steel trowel or putty knife for efficient coverage. When dealing with cracks and holes, force the compound into the crevices, finishing with a 25mm band at a 3mm thickness along the length. For larger areas, employ a closely woven glass fibre membrane embedded in the compound and overlap the hole or crack by 50mm, allowing for a seamless, reinforced finish after drying with a second coat.
Please note:
Question:
Would it work on a pvc ropf
Answer:
No. It could melt the PVC
Question:
Will this seal gap between base of summerhouse and concrete base? The summerhouse bearers go around the perimeter of the summerhouse. They have been sealed inside and out with mastic sealer but still getting some water ingress when it rains.
Answer:
This should do the job for you but if you wanted to send us photos to sales@roofingsuperstore.co.uk we can always contact our suppliers technical team to double check for you.
Question:
will this product seal against glass?
Answer:
I am afraid not, this product is mainly suitable for mastic asphalt, roofing felt, corrugated iron, cast iron, fibre cement, slates, lead, copper, zinc, concrete and timber. But not Glass.
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