(One particular brand name is Chimney RX Brushable Crown Repair; sold by the gallon at saversystems.com) Include the entire crown and then smooth it with a paintbrush (Photo two). Wait until the sealer dries tacky to the contact, then use a next coat with a brush. Cleanse up with water. https://fireplace-inserts79890.blogginaway.com/28634216/the-smart-trick-of-fireplace-cleaning-that-no-one-is-discussing