The best way to seal a leaking skylight is to address the problem systematically by identifying the exact entry point and using professional-grade waterproofing materials. Start by thoroughly cleaning the entire perimeter of the skylight frame and removing all dirt, moss, and old degraded caulking. Inspect the metal step flashing and counter-flashing for gaps, rust, or loose fasteners, applying a generous bead of exterior-grade polyurethane or neutral-cure silicone sealant over all vulnerable joints and fastener heads. If the leak originates where the glass meets the frame, apply a specialized structural glazing sealant designed for continuous outdoor exposure. However, if the flashing is severely damaged or improperly woven under the roof shingles, surface caulking will only serve as a temporary band-aid, meaning you must hire a professional roofer to rebuild the flashing kit for a permanent solution.
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