Can this be applied during rain or in damp conditions? i have previously used ikopro emergency repair but its now quite expensive. thank you.

Yes, in damp conditions , but any excess surface water should be removed before application.

Is this product suitable for sealing leaking cast iron guttering.

can use but better to get bitumen flashing tape

Do you need to heat the mastic before applying? Thanks Glennis

Worked for me without heating but would be better use it on a worm bay

Is this mastic good for pooling on a garage roof?

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

Sika Black Jack 903 Bitumen Trowel Mastic Black 5 Litre

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

Help Track order

Account Cart

1032.45 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

Description

🖤 Seal it fast, seal it smart — the ultimate bitumen fix for pros who don’t wait.

RAPID SEAL MASTERY - Dries to a tough, waterproof skin in just 24 hours—get your project moving faster.
READY TO USE POWER - No mixing or thinning needed—apply straight from the tin with your steel trowel or putty knife.
SIZE YOUR JOB RIGHT - Available in 1L, 2.5L, and 5L tins to match any scale of repair or maintenance.
ALL TERRAIN ADHESION - Seals and fills holes on asphalt, metal, concrete, timber, and more—one product, endless fixes.
FLEX GUARD TECHNOLOGY - Stays flexible after application to withstand moderate movement without cracking.

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.

Specifications

ASIN	B0073S5P2A
Batteries Required?	No
Batteries included?	No
Best Sellers Rank	241,506 in DIY & Tools ( See Top 100 in DIY & Tools ) 135 in Roof Coatings & Paints
Colour	Black
Customer Reviews	4.6 4.6 out of 5 stars (179)
Date First Available	31 Jan. 2012
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

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

Zainab N.

Fantastic and great service. Shipping was faster than expected.

1 week ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.