502 RC-W Elasto Kote (Base & Finish)

502 RC-W Elasto Kote (Base & Finish)

Available in: 5 gallon pails & 55 gallon drums

KARNAK 502 RC-W Elasto-Kote is a highly elastic, thermoplastic rubber based, single component exterior waterproofing coating.



Cool Roof Rating Council (CRRC)
1. Solar Reflectance:
Initial 0.85 3 year 0.72
2. Thermal Emittance:
Initial 0.89 3 year 0.92
3. SRI:
Initial 107 3 year 89



Coverage Calculator

  • 1.5-1.5 Gallons per 100sf**


This is intended as a general guideline only, coverage can vary based on many factors.


KARNAK 502 RC-W Elasto-Kote is intended for use on metal roofs, spray polyurethane foam roofs, EPDM, TPO, and most PVC roof membrane. Also good over previously coated surfaces as well as for coating concrete, concrete block, brick, cinder block, stucco and wood. Do not apply over asphaltic surfaces. PVC and TPO roofs should be at least 4 years old before coating.

Product data sheet: Roofing

Product data sheet: Metal

Physical Properties

Weight Per Gallon: 9.3 lbs.
Permeability: 0.01 Perm
Solids by Weight: 50%
Solids by Volume: 40%Color: White, Gray
Hardness Shore A: 65
Elongation: 650%
Tensile Strength: 1650 psi
Vapor Transmission: 0.25
Water Absorption (7 days): 0.4%
Dry Time (To Touch): 4 to 6 hours @ 77°F 50% relative humidity
Application Temperature Range: 40F and rising
Service temperature Range: -15°F to 180°F
Cure Time: 12 to 24 hours @77°F 50% relative humidity

VOC: 557 g/L


Preparation & Application


Standard colors are: white, gray, khaki tan, patina green and red. All other colors on our color chart are special order and require a minimum purchase of 210 gallons.

All roof surfaces to be coated should be clean and free of dirt, dust flaking and pitting rust, grease, oil, and loose paint. New masonry surfaces should be  allowed to cure 30 days before application of coating. EPDM roof surfaces should be cleaned with 507 SPC Primer/Wash. Other single ply membranes should be cleaned with 799 Wash-N-Prep Roof Cleaner and water. Patch and repair all seams, flashings with KARNAK 502MS Karna-Flex and KARNAK 5540 Resat-Mat or 550 Patch-N-Go or appropriate sealants and caulking materials. Contact KARNAK Technical Services at 800-526-4236 for questions regarding surface  preparation.

KARNAK 502 RC-W Elasto-Kote Base and Finish may be applied by brush, roller or spray equipment.

Apply KARNAK 502 RC-W Elasto-Kote Base at the rate of 1.5 gallons per 100 sq. ft. Allow base to dry 24 hours before applying 502 RC-W Elasto-Kote Finish at the rate of 1.5 gallons per 100 sq. ft. Coverage rate will vary due to texture and porosity of the surface. Film thickness should be approximately 24 mils dry. KARNAK 502 RC-W Elasto-Kote Finish will take approximately 24 hours to cure. EPDM roofs should first be coated with KARNAK 502 RC-W Base at the  rate of 0.5 gallons per 100sq. ft. followed by two coats of KARNAK 502- RC-W Elasto-Kote Finish at 1-1.5 gallons per 100 sq. ft. per coat.


Caution/Care of Tools

Do not use near open flame. Avoid breathing solvent fumes and prolonged contact with skin. Do not take internally.If swallowed, do not induce vomiting. Call a physician immediately. Keep out of reach of children. Keep container covered when not in use. Do not thin. Dispose of in an environmentally safe manner. Cover air intakes during application and while drying.

Tools may be cleaned with xylol, mineral spirits, lacquer solvents or Karna-Klean. Take necessary safety precautions when handling flammable materials.

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