The best roof sealer for skylights is typically a high-grade, exterior-grade polyurethane sealant or a specialized neutral-cure silicone sealant engineered specifically for roofing and flashing applications. Polyurethane sealants are exceptionally popular among professional contractors because they offer superior flexibility, withstand extreme temperature fluctuations without cracking, and can even be painted over to match your existing roof aesthetic. Neutral-cure silicone is another top-tier choice because it adheres tightly to glass, aluminum, vinyl, and wood surfaces without releasing corrosive byproducts during the curing process. Avoid cheap acrylic or rubberized asphalt caulks, as they degrade rapidly under continuous ultraviolet sun exposure and lose their elasticity quickly. For emergency fixes or heavy-duty moisture barriers around complex skylight curbs, elastomeric brush-grade flashing cements also provide robust, long-lasting waterproof protection against driving rain.
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