An extremely durable sealer and coating that will not sag or drip in summer heat or crack in winter cold. Sprays as a liquid, flows into low spots, cracks and crevices then dries to a durable black coating. Great for asphalt and fiberglass shingles, built-up tar and gravel, single ply rubberized and granulated roofs, chimneys, vents, basement foundations and more. Still just as effective on wet surfaces and twice as thick as retail brands.