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Sika Black Jack 903 Bitumen Trowel Mastic – 5 Litre
SKU:
90305
Availability:
7
In Stock
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- £27.04 incl. VAT
- £27.04
- Unit price
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Sika Black Jack 903 Bitumen Trowel Mastic 5L – Heavy-Duty Roof Repair & Waterproofing Compound
Take control of roof repairs with Sika Black Jack 903 Bitumen Trowel Mastic, a professional-grade, fibre-reinforced bitumen compound designed for sealing, bonding, and repairing roofs in all weather conditions.
This thick, trowel-applied mastic forms a tough, weatherproof seal immediately after application, even on damp surfaces—making it perfect for urgent repairs where speed and reliability matter.
Key Features & Benefits
- Instant Waterproof Protection – Effective even on damp surfaces for quick repairs
- Fibre-Reinforced Strength – Added fibres improve durability and resistance to cracking
- Heavy-Duty Trowel Grade – Thick consistency ideal for filling gaps, joints, and holes
- Highly Water & Weather Resistant – Withstands rain, frost, and harsh UK conditions
- Semi-Flexible Finish – Remains flexible after curing to accommodate movement
- No Primer Needed (Most Surfaces) – Fast, straightforward application
Ideal Applications
Perfect for a wide range of roofing and maintenance jobs, including:
- Emergency roof leak repairs
- Filling cracks and holes in roofing felt and asphalt
- Sealing gutters, downpipes, and flashing
- Repairs to corrugated iron and metal roofs
- Bonding and sealing joints in roofing systems
Compatible with multiple surfaces including felt, asphalt, lead, zinc, concrete, brick, and metal, making it a versatile solution for trade and DIY use.
Why Choose Black Jack 903 Trowel Mastic?
Unlike standard sealants, Black Jack 903 is built for heavy-duty roofing repairs. Its thick, reinforced formula allows it to bridge gaps, fill deep cracks, and provide long-lasting waterproof protection, even in challenging conditions.
The 5L trade size is ideal for larger jobs or repeat use, delivering excellent coverage while reducing the need for multiple tins.
Returns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Specification
Brand
Sika
Colour
Black
Coverage
2 litres per m² (giving 2mm wet thickness)
Curing rate
24 hours to develop a surface skin, the mass below remaining plastic for many months.
Density
ca. 1.45 g/cm3
Size
5 Litres
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