WATERSTOP Repair Spray
Waterproof repair spray to stop leaks in hard-to-reach areas
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Features & benefits
Bostik WATERSTOP Repair Spray is a flexible, waterproof coating spray designed for quick and effective repairs around the home and garden. Ideal for tackling everyday maintenance jobs in hard-to-reach areas, it helps stop leaks fast by forming a durable barrier against water, heat and frost. Whether you're dealing with a cracked roof tile, a leaking gutter, or worn exterior surfaces, this easy-to-use spray provides reliable protection with minimal effort.
Perfect for outdoor use, this waterproof repair spray effortlessly covers small gaps and cracks to create a strong, watertight seal. It’s well suited for repairing damaged roofing, sealing joints in gutters and downpipes, and protecting exposed wood from water ingress. The versatile formula also makes it a practical choice for a variety of surfaces, helping extend the life of key areas around your home.
Once cured, the coating forms a tough, weather-resistant layer that stands up to changing conditions. Designed with DIYers in mind, it delivers long-lasting performance while being simple to apply, making it an essential solution for quick fixes and preventative maintenance.
Waterproofing spray that quickly stops leaks around the home
Ideal sealant spray for roof tiles, gutters, masonry, and exterior wood
Perfect for hard-to-reach repairs
Easy-to-apply waterproofing membrane spray with non-drip, controlled application
No primer, tools, or specialist skills required
Bonds to metals, roofing boards, mineral surfaces, wood, and more
Forms a water-resistant barrier to help prevent future damage
Heat and frost resistant for long-lasting outdoor performance
Exterior use only
Technical information
Bostik DIY United Kingdom Waterstop Repair Spray Technical Data Sheet (328.99 KB)
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How to use
PREPARATION
- Clear away leaves, moss, dirt, rust or debris. Degrease and clean any contaminants to ensure the surface is sound.
- For best results, protect the affected surface from rain until product fully cures.
APPLICATION
- Spray at 25-30cm from the surface and apply a continuous, even layer over the damaged or leaking area, making sure to cover cracks, seams or joints thoroughly.
- Allow the first coat to dry (approx. 10-20 minutes) before applying the second coat - it should be dry to touch.
- Full cure typically takes 8 hours under normal conditions.
- After curing, test the repair with water via a hose or rainfall, to ensure leaks are completely sealed. Check that the coating is continuous, without gaps or thin spots. Reapply a layer if the leak persists.
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FAQs
How long does a waterproof coating last?
A good waterproof coating can provide long-lasting protection, but exactly how long it lasts will depend on the surface, weather exposure and how well it has been applied.
Bostik WATERSTOP Emergency Waterproof Coating is designed to resist cracking, UV, frost and temperature changes for durable outdoor protection.
Bostik WATERSTOP Repair Spray is designed to provide durable protection against water and humidity and resists UV, heat, frost, salt and water.
What is the best waterproofing coat?
The best waterproofing coating depends on the job:
- For leaking flat roofs and gutters, look for a flexible, weather-resistant coating that works on your particular surface. Bostik WATERSTOP Emergency Waterproof Coating provides an instant waterproof barrier and can be applied to materials including concrete, stone, wood, metal, clay, tiles, slate and felt, without needing a primer.
- For small cracks and hard-to-reach areas, Bostik WATERSTOP Repair Spray is a handy choice. Its flexible rubber formula creates a strong, waterproof coating and works on many outdoor materials, including roofing, metal, mineral surfaces, boards and wood. For larger roof and gutter leaks, a brush-on waterproof coating may be more suitable.
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