ADOS Leak Stop Clear 300ml – Instant Waterproofing Sealant for Wet and Underwater Applications

When a leak hits, you need a sealant that acts instantly and stays reliable no matter the conditions. ADOS Leak Stop Clear 300ml from CRC delivers a fast, permanent waterproof seal that forms a flexible membrane on both wet and dry surfaces. It bonds quickly and moveably, so your fix won’t crack or fail as the building shifts or as weather changes.

Why this matters — traditional sealants often require dry surfaces or lengthy cure times. With primerless adhesion, ADOS Leak Stop Clear bonds to dry or wet substrates without additional primers, which speeds up emergency repairs and routine maintenance alike. The result is a dependable seal you can trust in rain, snow, and even underwater conditions.

Key Features that Make a Difference

• Instant, weatherproof seal that grips in rainy, snowy, or submerged environments and remains durable once cured.
• Broad substrate compatibility — adheres to aluminium, galvanised iron, lead, glass, concrete, wood, stone, asphalt, corrugated iron, roofing felt, PVC guttering, and bituminous waterproofing sheeting.
• Primerless adhesion — bonds to dry or wet surfaces without surface-prep primers, speeding up fixes from emergencies to everyday repairs.
• Silicone-free with high elasticity — maintains flexibility under movement (tolerates up to 10 mm) and resists UV exposure for long-lasting waterproofing.
• Extreme temperature tolerance — workable from -5°C to 40°C and sustained performance from -25°C to 100°C, ideal for outdoor use year-round.
• Compact 300 ml cartridge — a convenient size for quick fixes and mid-sized projects, with clean, controlled application.
• Versatile applications — perfect for general sealing, roofing, gutters, skylights, chimney connections, ventilation pipes and ducts, sheet-metal covers, vents, flashings, and downpipes. It also bridges gaps up to 10 mm in both wet and dry conditions.

Real-World Scenarios

Think of a roof leak during a torrential downpour, a gutter joint that splashes water every time it rains, or a pipe seam that’s leaking underwater after a storm. ADOS Leak Stop Clear is designed for these situations and more—delivering immediate containment and forming a durable membrane that moves with the substrate, not against it. It’s equally suited for skylights, vents, and downpipes where weather exposure is constant and reliability is non-negotiable.

How It Helps Your Projects

• Emergency repairs— seal leaks quickly without waiting for perfect conditions or surface priming.
• Ongoing maintenance— create long-lasting seals on roofs, gutters, and plumbing penetrations with a product that stands up to sun and temperature swings.
• Everyday durability— a silicone-free formula reduces gummy residues and ensures flexible protection that won’t crack as structures move up to 10 mm.

Tips for Best Results

For larger cracks, apply in multiple passes to build a robust seal. Always reseal the cartridge between uses to preserve elasticity and adhesion. Use on the recommended substrates for best bonding, and remember: the membrane remains flexible to accommodate substrate movement and temperature changes over time.

Who’s it for? Homeowners, property managers, and tradespeople who need fast, dependable waterproofing that works in challenging environments. If you’re sealing roofs, gutters, skylights, chimney connections, or pipe penetrations—and you want a silicone-free, primerless solution that performs in wet and underwater conditions—ADOS Leak Stop Clear 300ml is designed for you. This product sits squarely in CRC’s line of protective coatings and sealants, bringing proven performance to everyday waterproofing challenges.