Once a year, reseal your roof completely. Some Sealants spread on easily with mop or brush. You can apply other types with high- pressure spray guns. However, one word of caution Exercise care walking on the roof. Some manufacturers suggest Sealing their roofs from a scaffold. Others suggest laying a large piece of plywood on the roof to distribute your weight broadly. You don’t Want to dent your roof or step through it.
You may find sealing products in a variety of colors. Remember that a light-colored or silver roof reflects hot sun rays best. You’ll appreciate this most if you live in a hot climate. If you live in a mostly cool climate, a dark roof tends to hold the sun’s warm rays, adding some extra heating on cold but sunny winter days.