Sweep the shed roof with a push broom. Remove all twigs, dirt, leaves and debris from the roof.
Rinse the shed roof thoroughly with water to wash away any remaining dust fragments or grime. Stand on the roof while spraying it with a garden hose. Let the roof air-dry for at least 24 hours.
Gear up in rubber gloves and full-length clothes to reduce exposure to the roof coating. Stir the fibered roof coating with a wooden paint stirrer before pouring the coating into a paint tray.
Coat the edges of the shed roof with the fibered coating using a nap roller. Make one pass around the perimeter of the roof.
Cut in around roof pipes, skylights and other penetrations with the fibered coating using a paintbrush. Extend the coating 6 inches beyond the roof penetrations.
Fill in the remainder of the shed roof with the coating. Using the roller, apply the coating back and forth over the expanse of the roof at the rate of 1 gallon of coating for every 100 square feet of roof.
Let the sealed shed roof cure for three days.