What is the purpose of a leak-stopping compound?

• A. To seal large holes permanently
• B. To lubricate seals
• C. To seal micro-leaks in hull patches and provide temporary watertightness
• D. To repaint hull

Answer: (C)

The purpose of a leak-stopping compound is to seal small leaks and provide temporary watertightness while a permanent repair is planned or carried out. It bonds to the hull surface and fills micro-cracks or tiny gaps around patches, creating a flexible seal that can withstand seawater pressure long enough to stop the ingress of water. This is crucial for maintaining buoyancy and safety during damage-control operations. It’s not intended for sealing large holes or for lubricating seals, and it isn’t a repainting product—the goal is a quick, short-term seal, not a cosmetic or permanent solution.