(One particular brand is Chimney RX Brushable Crown Repair; bought with the gallon at saversystems.com) Protect the complete crown and after that clean it with a paintbrush (Image two). Wait until the sealer dries tacky to your touch, then implement a next coat with a brush. Clear up with water. https://lorenzoouwsq.bloggazza.com/27593605/not-known-facts-about-chimney-cleaning