Sika Black Jack 903 Bitumen Trowel Mastic, Black, 5 Litre
Product ID: 50087866
🖤Flexible long-lasting black bitumen
⏱️Fast drying in 24 hours
🛠️Versatile multi-surface adhesion
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🖤 Seal it fast, seal it smart — the ultimate bitumen fix for pros who don’t wait.
Sika Black Jack 903 Bitumen Trowel Mastic is a heavily-filled, fibre-reinforced black bitumen sealant designed for fast drying and flexible waterproofing. Suitable for a wide range of surfaces including roofing felt, metal, concrete, and timber, it offers durable adhesion and flexibility to accommodate moderate movement. Ready to use and available in multiple sizes, it’s the go-to solution for professional-grade sealing, filling, and bonding tasks.
| ASIN | B0073S5P2A |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 74,983 in DIY & Tools ( See Top 100 in DIY & Tools ) 50 in Roof Coatings & Paints |
| Colour | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (176) |
| Date First Available | 31 Jan. 2012 |
| Delivery information | We cannot deliver certain products outside mainland UK ( Details ). We will only be able to confirm if this product can be delivered to your chosen address when you enter your delivery address at checkout. |
| Guaranteed software updates until | unknown |
| Included Components | B/J BITUMEN TROWEL MASTIC 5LT |
| Item Package Quantity | 1 |
| Item Weight | 6.12 kg |
| Item model number | 903 |
| Manufacturer | Sika Everbuild |
| Material | Iron |
| Part Number | 004952 |
| Power Source | ac |
| Product Dimensions | 18 x 18 x 23.5 cm; 6.12 kg |
| Size | 5 Litre |
A**Y
Trowel applied mastic.
Excellent product, replacing the felt on my garage roof the mastic worked better than the roof felt adhesive.
R**L
Great product
Great product really good coverage and fast delivery
K**2
Good value
Not used it yet. But, I'm sure it'll do the job. Good value, arrived quickly. Only one criticism. Maybe stronger packaging required (or more careful courier). Pretty heavy, the bottom of the tin is bulging out from a drop. Fortunately, it's not split, so it doesn't really matter, but could have been messy.
V**S
Perfect for dealing with leaks on a flat roof
Perfect for sealing leaks on damaged areas on flat roof.
M**.
Just what I needed
I needed something to prevent moisture from wicking up an array of concrete plinths and rotting the decking they supported. This thick, solvent-based jollop was exactly what I needed. I expect it'll outlast me.
A**R
Decent product.
Easy to use and looks like it will last a few years.
J**N
Thank you.
No problems.
M**T
Excellent product.
Easy to apply, I used an old brush to get the bitumen into the joints and coat inside an old wallhead gutter which had been leaking into the cavity. Quite a number of joints around a bay window. Rainwater seems to flow much better around the gutters now. The remainder of the Black Jack will be kept for later touch-up and general roof repairs.
J**H
décevant
décevant, , ne tient pas les intempéries, se décolle
Trustpilot
3 weeks ago
2 weeks ago