Application
Reinforce all “moving” cracks, seams, splits, control joints, vertical/horizontal interfaces, roof termination points, openings, transition areas, around the base of all
vents, pipes and other protrusions, as well as around HVAC units and other roof mounted equipment with polyester mesh, embedded into a base coat of MARATHON CRC. Light or Medium Gray is normally used as the base coat color.

If incorporating polyester fabric for reinforcement of the entire roof, roll the fabric over a strip-coat of wet MARATHON CRC, allowing the fabric to conform to the surface contours. Do not allow the MARATHON CRC to surface skin prior to rolling out the fabric. Work the MARATHON CRC evenly throughout the fabric so that it is totally saturated, eliminating any air pockets, wrinkles or gaps. Apply an additional coat of MARATHON CRC over the top of the saturated fabric taking extra care to ensure that edges of the fabric are well saturated and adhered. Overlap consecutive passes of reinforcement fabric a minimum of 2” on each side.

MARATHON CRC may be applied by airless spray equipment or roller. Brush or roller may be used for touch-up and edging work, or for small areas that are not practical for spray application. Airless spray is best suited for field application.

MARATHON CRC must be applied in two or more separate coats to ensure proper coverage and cure rate, and to achieve a pinhole-free continuous film. It is recommended that Gray be used for the first coat(s), thus making it easier to visually control the application of the final coat in White or specified custom color.

Each coat of MARATHON CRC shall be applied in a direction perpendicular to the previous coat except when coating metal roof panels. On metal roofs, each coat of MARATHON CRC shall be applied parallel to the vertical ribs, taking care to coat both sides of each rib. Edges of flat roof areas shall be pre-coated in a “picture frame” configuration.

MARATHON CRC shall extend up and over all roof substrates on vent pipes, walls, parapets and other protrusions to terminate a minimum of 3” above the substrate, creating a self-terminating flashing. Extend coating under all counter-flashings where utilized.

Typical application rate is 2 to 4 gallons per 100 sq. ft. (.8 to 1.2 l/m²), depending on the existing substrate and desired warranty. Contact UNITED’S Technical Service Department for dry film thickness requirements. All surfaces must be uniformly coated and free from voids, pinholes or blisters.