Dicor also makes a pretty good roof coating that comes in two parts. The first is a cleaner/bonding agent/primer for the coating. You apply the primer with a sponge mop and prime the whole roof. After it's done drying you start the coating. Simply paint the stuff on with a rolling paint brush front to back. You don't have to remove the A/C or anything but if you have vent covers then they will need to come off so you can hit around the vents properly. The bonding agent comes in a quart and the coating comes in a gallon. You should try to do 2 coats of this stuff to make sure you hit everything. One gallon and one quart will do 125 Square feet (using two coats). Hope this helps!
