Karnak Roofing 502 RC-W Elasto-Kote Base Coat

502 RC-W Elasto-Kote Base Coat is intended for use on metal roofs (includes a rust inhibitor), spray polyurethane foam roofs, EPDM, TPO, and most PVC roof membranes. Also good over previously coated surfaces as well as for coating concrete, concrete block, brick, cinder block, stucco and wood. May be applied over 405 Bond-N-Shield Base Coat over smooth BUR and smooth or granule modified bitumen membrane roofs. PVC and TPO roofs should be at least 4 years old before coating.

All roof surfaces to be coated should be clean and free of dirt, dust flaking and pitting rust, grease, oil, and loose paint. Recommended application temperature is 40°F to 120°F. New metal must be allowed to age 30 days and new masonry surfaces should be allowed to cure 30 days, before coating. EPDM roof surfaces should be cleaned with 507 SPC Primer/Wash. Other roof surfaces should be cleaned with 799 Wash-N-Prep Roof Cleaner and water. Patch and repair all seams, flashings with 502MS Karna-Flex and Resat-Mat or appropriate sealants and caulking materials. Contact KARNAK Technical Services at 800-526-4236 for questions regarding surface preparation.

Mix lightly prior to application of the coating. 502 RC-W Elasto-Kote Base Coat may be applied by brush, airless spray equipment or roller. For applications in higher temperatures (above 90 °F) KARNAK recommends application in multiple thin coats to prevent trapped moisture problems. Commencement of work by the contractor implies his approval of the deck surface. ROLLER / BRUSH APPLICATION Apply with a 3/4" – 1-1/4” nap roller or soft roof brush. SPRAY APPLICATION Utilize an airless spray pump. Equipment manufacturer should be consulted for more complete information. Spray application should be done with a 30% over-spray pattern.

Apply 502 RC-W Elasto-Kote Base Coat at the rate of 1.5 gallons per 100 sq. ft. (24 wet mils). Allow base to dry 24 hours before applying 502 RC-W Elasto-Kote Finish Coat. Coverage rate will vary due to texture and porosity of the surface. Film thickness should be approximately 18-20 dry mils. 502 RC-W Elasto-Kote Base Coat will take approximately 4-6 hours to dry to the touch. EPDM roofs should first be coated at the rate of 0.5 gallons per 100 sq. ft. (8 wet mils) followed by two coats of 502 RC-W Elasto-Kote Finish Coat at 1.25-1.5 gallons per 100 sq. ft. per coat (20-24 wet mils).