--- product_id: 50087866 title: "Sika Black Jack 903 Bitumen Trowel Mastic – Trowelable Bituminous Compound – Black – 5 Litre" price: "€ 58.29" currency: EUR in_stock: true reviews_count: 9 url: https://www.desertcart.ie/products/50087866-sika-black-jack-903-bitumen-trowel-mastic-trowelable-bituminous-compound store_origin: IE region: Ireland --- # Long-lasting waterproof seal Fast drying in 24 hrs Versatile adhesion on 10+ surfaces Sika Black Jack 903 Bitumen Trowel Mastic – Trowelable Bituminous Compound – Black – 5 Litre **Price:** € 58.29 **Availability:** ✅ In Stock ## Summary > 🛡️ Seal it fast, seal it right — the pro’s choice for watertight confidence! ## Quick Answers - **What is this?** Sika Black Jack 903 Bitumen Trowel Mastic – Trowelable Bituminous Compound – Black – 5 Litre - **How much does it cost?** € 58.29 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/50087866-sika-black-jack-903-bitumen-trowel-mastic-trowelable-bituminous-compound) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Pro-Grade Coverage:** 5 litres of premium bitumen compound delivers professional-grade waterproofing and sealing for your toughest repairs. - • **Flexible Durability:** Stays flexible for months, preventing cracks and ensuring lasting protection against the elements. - • **Universal Grip Power:** Bonds seamlessly to roofing felt, metal, concrete, timber, and more—one mastic to rule them all. - • **Eco-Aware Performance:** Formulated with plasticisers to enhance adhesion and reduce cracking, while mindful of environmental impact. - • **Rapid Seal, Zero Wait:** Skins over in just 24 hours, so your project moves fast without compromising flexibility. ## Overview Everbuild Black Jack 903 Bitumen Trowel Mastic is a 5-litre, fast-drying, flexible bituminous compound designed for sealing, filling, and waterproofing a wide range of surfaces including roofing felt, metal, concrete, and timber. It skins over in 24 hours but remains flexible for months, ensuring durable protection against water ingress and moderate movement. Enhanced with plasticisers for improved adhesion and crack resistance, this professional-grade mastic is ideal for roofing and building maintenance projects. ## Description From the manufacturer About Everbuild Everbuild – A Sika Company are the UK and Ireland’s largest manufacturer of sealants, adhesives, DIY products, powders and building chemicals. Everbuild are proud to be home to the trade’s most respected products which have been enhanced over the years by class-leading research and facilities. With unique technology including i-Cure and Active Resin Technology, Everbuild’s product development activity is relentlessly setting industry standards at the highest quality and leading the field in solving the problems of the future, today. Review: Great product - Great product really good coverage and fast delivery Review: Trowel applied mastic. - Excellent product, replacing the felt on my garage roof the mastic worked better than the roof felt adhesive. ## Features - Causes damage to organs through prolonged or repeated exposure. - May cause drowsiness or dizziness. - Repeated exposure may cause skin dryness or cracking. - Toxic to aquatic life with long lasting effects. - FLEXIBLE – Remains flexible for long periods after application to allow for moderate movement. - VERSATILE – Suitable for sealing and filling holes in mastic asphalt, roofing felt, corrugated iron, metal guttering and downpipes, as well as waterproofing, stopping, bedding, bonding and sealing applications. - FAST DRYING – Fast drying, skinning over in just 24 hours. Adheres to and fills holes in mastic asphalt, roofing felt, corrugated iron, cast iron, fibre cement, slates, lead, copper, zinc, concrete and timber. - EASY TO USE – Ready to use and does not need to be diluted with thinner. Apply using a steel trowel or putty knife. - DIFFERENT QUANTITIES – Available in 1-litre, 2.5-litre and 5-litre tins for tackling a variety of jobs. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0073S5P2A | | Batteries Required? | No | | Batteries included? | No | | Best Sellers Rank | 12,329 in DIY & Tools ( See Top 100 in DIY & Tools ) 27 in Roof Coatings & Paints | | Colour | Black | | Customer Reviews | 4.4 4.4 out of 5 stars (540) | | 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. | | 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 | ## Images ![Sika Black Jack 903 Bitumen Trowel Mastic – Trowelable Bituminous Compound – Black – 5 Litre - Image 1](https://m.media-amazon.com/images/I/71N8bl17wzL.jpg) ![Sika Black Jack 903 Bitumen Trowel Mastic – Trowelable Bituminous Compound – Black – 5 Litre - Image 2](https://m.media-amazon.com/images/I/91Gdcs2cKkL.jpg) ![Sika Black Jack 903 Bitumen Trowel Mastic – Trowelable Bituminous Compound – Black – 5 Litre - Image 3](https://m.media-amazon.com/images/I/717psYjJQIL.jpg) ## Questions & Answers **Q: Can this be applied during rain or in damp conditions? i have previously used ikopro emergency repair but its now quite expensive. thank you.** A: Yes, in damp conditions , but any excess surface water should be removed before application. **Q: Is this product suitable for sealing leaking cast iron guttering.** A: can use but better to get bitumen flashing tape **Q: Do you need to heat the mastic before applying? Thanks Glennis** A: Worked for me without heating but would be better use it on a worm bay **Q: Is this mastic good for pooling on a garage roof?** A: Hi. There I used it to seal under the weather board on my up &over garage door a good while ago and up to now there has been no water lngress hope this helps ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great product *by R***L on 11 November 2025* Great product really good coverage and fast delivery ### ⭐⭐⭐⭐⭐ Trowel applied mastic. *by A***Y on 10 July 2025* Excellent product, replacing the felt on my garage roof the mastic worked better than the roof felt adhesive. ### ⭐⭐⭐⭐ Good value *by K***2 on 11 April 2024* 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. ## Frequently Bought Together - Everbuild Black Jack 903 Bitumen Trowel Mastic | Heavily Filled, Fibre Reinforced and Trowellable Bituminous Compound - Black - 5 Litre - Faithfull Tar Brush Short Handle FAIBRTARSH - Everbuild Black Jack 901 Bitumen Paint – Solvent Based – Black – 5 Litre --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ie/products/50087866-sika-black-jack-903-bitumen-trowel-mastic-trowelable-bituminous-compound](https://www.desertcart.ie/products/50087866-sika-black-jack-903-bitumen-trowel-mastic-trowelable-bituminous-compound) --- *Product available on Desertcart Ireland* *Store origin: IE* *Last updated: 2026-06-04*