CHIMNEYRX Brushable Chimney Crown Repair, 1 Gallon Fast-setting, Flexible Coating that Seals and Protects Chimney Crown Tops - Repairs Cracked Chimney Crowns and Prevents Chimney Leaks Stops Chimney Water Leaks & Repairs Chimney Crown Cracks Specifically Formulated to Repair and Protect Fireplace & Chimney Crowns from Water Intrusion Covers Approximately 40 Square Feet per Gallon Easy to Apply With a 3 Inch or 4 Inch Paint Brush, & Cures in 2-4 Hours