Preparation

Surface must be sound, dry, and clean (free of dirt, gravel, pollution, mildew and all foreign material). Do not apply if rain is imminent. Repair flashings and damaged areas.

Built-up Roofs

Remove all gravel. The main reason gravel was on the roof was to protect the old surface from the sun's rays. Removing the gravel will greatly reduce the weight load on the roof and provide a firm surface for the new coating.
Sweep and vacuum or power wash surface to remove dirt and dust. Cut out roof blisters and repair with acrylic embedded in polyester fabric or polymer concrete.

Shingle or Rolled Roofing

Broom sweep the roof. Remove mildew with sodium hypochlorite or other algaecide and rinse with water. Tack down curled, lifted seams flush with the surface. Fill any other gaps with silicon impregnated latex caulk. Any loose shingles should be gently lifted and glued down with roofing cement.

Metal Roof Surface

Wire brush any heavily rusted areas. Wash the roof surface. Fill small cracks with silicon impregnated latex caulk. Seal joints, cracks and roof protusions such as chimneys, skylights and HVAC units with ASA 603 CEP and polyester fabric. Apply ASA 603 PRIME over the roof surface at a rate of 1 gallon per 200 square feet.

Apply ASA 606 Acid Rain Resistant Coating

Do not allow stored product to freeze. Mix thoroughly before using blending any precipitated solids off the bottom.
The best method to assure good penetration of the first coat into the surface is by application with a 3/4 inch nap roller. If sprayed into polyester fabric it should also be backrolled to assure saturation of the fabric.  The succeeding coats may be spray or roller applied.
ASA 606 can be installed with conventional airless spray equipment. A 30 to 1 ratio airless pump with a 3/4 inch ID hose is preferred using a a .041 to .045 orifice tip.
Multiple thin coats are preferable to one thick coat.
Allow the coating to cure thoroughly before applying the next coat. 1 to 8 hours depending on temperature, humidity and wind conditions.
Do not apply if rain is imminent within 4 hours after application or less than 4 hours before the dew settles.
Minimum application temperature is 40° F temperature rising with neither frost nor precipitation expected for 48 hours. Ideal application conditions are 65-85 F° with humidity levels below 70% RH.