From The United Coatings brochure:

The Coating System That Lets You And Your Roof Breathe Easier
Roof Mate is a permanently flexible, 100% acrylic coating for use over a wide variety of sound substrates, such as conventional built-up, modified bitumen, metal, concrete, wood, and asphalt shingles. This elastomeric membrane extends the life of these new or existing roofing systems by providing long-term weatherproofing and light reflectivity. Yet, unlike conventional roofing, Roof Mate is especially formulated to "breathe". This means that moisture vapor from within the building or substrate can get out, but water from the exterior can’t get in. For get about cracking, peeling, or annual replacement, Roof Mate protects against normal weathering, aging, and ultra-violet exposure for years of worry-free performance. It’s even fire-retardant for extra peace of mind. Nothing covers you better than Roof Mate.

A Tough, Waterproof Elastomeric Seal Ice, snow, sand, even standing water won’t penetrate Roof Mate’s tough, dense surface under normal weather conditions. Roof Mate stays flexible in temperature as low as -30&Mac176;F without cracking or separating from the roof surface. Maintaining your sealed roof couldn’t be easier. An occasional touch-up with additional Roof Mate or an acrylic caulk is all that’s necessary.

Technology That Can Save An Old Roof And Your Money
Roof Mate provides he ultimate in convenience. There are not bulky or expensive materials to haul, lift, spread, cut, or glue. Roof Mate flows on fast and easy using airless spray, roller, or brush. It dries in as little as two hours to resist wash-off from rain or heavy dew. You don’t need any harsh chemicals to clean your tools and hands, either, because Roof Mate cleans up with water.
You can properly prepare and coat your roof in a lot less time than it takes with heavy built-up materials or single-ply systems. Roof Mate is also lightweight, which puts less stress on the building. Its unique, cross-linked acrylic surface stays clean by repelling dirt and airborne pollutants.