Heavy-Duty Waterproofing with Soudal Waterstop Instant Repair
Protect roofs, terraces and balconies from leaks with Soudal Waterstop Instant Waterproof Repair, a fibre-reinforced, high-performance coating designed to stop water ingress fast. This premium Soudal Waterstop formula creates a fully waterproof, elastic rubber barrier that adheres to wet or dry surfaces – making it ideal for emergency repairs and long-term protection.
Developed as a thick, brush-on or roller-applied compound, Soudal Waterstop bridges cracks, tears and gaps, even over large damaged areas. Its fibre-reinforced construction provides excellent structural strength and durability, while remaining flexible enough to cope with temperature changes, movement and weather exposure. Once cured, it becomes UV-resistant, walkable, and offers a service life of at least 10 years.
Whether you need to seal flat roofs, repair gutters, waterproof balconies or provide urgent leak protection, Soudal Waterstop delivers reliable performance – even in sub-zero temperatures.
Key Features of Soudal Waterstop Waterproof Repair:
- Fibre-reinforced waterproof roof repair compound.
- Creates a fully waterproof, elastic rubber barrier.
- Works on wet or dry surfaces.
- Suitable for use even in sub-zero temperatures.
- Bridges large gaps and repairs cracks, bubbles and tears.
- UV-resistant and non-discoloring.
- Walkable once cured.
- Long lifespan – at least 10 years.
- Ideal for roofs, terraces, balconies, gutters and emergency leak repair.
Useful Information
Ensure substrates are clean and free of dust and grease. Prime very porous surfaces with Waterstop thinned 10–15% with white spirit. Apply using a brush, roller or spatula (for underwater use) at temperatures above -15°C. For heavy damage, reinforce with Dakorub Fleece and apply a second coat after 8 days. Clean tools with white spirit. Coverage approx. 2kg/m². Suitable for bituminous substrates over one year old, as well as concrete, brick, metal, plastics and tiles.


