What is the effect of applying a leak-stopping compound to hull patches?

• A. To permanently seal all leaks
• B. To seal large gaps
• C. To improve patch adhesion
• D. To seal micro-leaks in hull patches and provide temporary watertightness

Answer: (D)

When hull patches are in place, a leak-stopping compound is used to seal tiny openings that may still leak. It fills microscopic pores and capillary channels around the patch, creating a temporary barrier that keeps water out. This gives crews time to perform permanent repairs or arrange safer conditions without allowing the vessel to flood further. It’s not meant to seal large gaps or cracks, which require proper patching or structural repair. And while it helps stop small seepage, its primary role isn’t to boost the patch’s adhesion; it’s to provide temporary watertightness by addressing micro-leaks.