507 SPC Primer/Wash (For EPDM Membranes)

507 SPC Primer/Wash

Available in: 1 gallon cans & 5 gallon pails

KARNAK 507 SPC Primer / Wash is a water-based cleaner designed to safely clean and prepare EPDM roof surfaces for subsequent coatings and repairs.




  • VOC: 0 g/L

Coverage Calculator

  • 0.2-0.2 Gallons per 100sf**


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


KARNAK 507 SPC Primer / Wash is appropriate for use on new and weathered EPDM roof membranes.

Physical Properties

Weight Per Gallon: 8.6 lbs.
Color: Clear
pH: Neutral

Preparation & Application

Surfaces should be free of all roof debris and in a water-tight condition.

Apply KARNAK 507 SPC Primer / Wash via a sprayer (Hudson-type agricultural) to the entire roof at an application rate of 500 square feet per gallon (0.20 gal. / 100 sq.ft.). Use a 3-4 foot arc pattern. Allow 507 SPC Primer to stand for 10-15 minutes. Clean EPDM roof with a commercial power washer (between 2000-3500 psi). When cleaning the EPDM, it should be done slowly and close to the surface in order to remove mica and inorganic release agents. Start washing up the roof. Then, back down to completely remove all residues. Care should be taken to not damage the EPDM roof membrane. Use caution when walking on roof surfaces, as the may be extremely slick. *Rinse thoroughly with power washer. The rinse step may be done at a faster pace then the cleaning step. In the final rinse water should be clear with no soap bubbles present. The EPDM membrane will range from muddy brown to black after washing with the 507 SPC Primer / Wash. When the surface is dry, coating may begin. *Due to the rinse water possibly containing dirt, mold, mildew algae and diluted 507 SPC, do not allow rinse to flow into drains or sewers leading to open bodies of water (lakes, ponds, streams, etc.). Do not dispose of the neat 507 SPC product into drains, sewers or open bodies of water. Rinse water from downspouts could stain concrete parking lots and decks as it flows to municipal  drains. Because of this, temporary hoses should be used to direct the rinse water.

0.20 gallon per 100 sq. ft. (500 sq. ft. per gallon).

Caution/Care of Tools

Do not apply when rain is imminent. Protect from freezing. Store in a cool, dry place. Keep container covered when not in use. Do not thin. Keep out of  reach of children. Avoid prolonged contact with skin and eyes. In case of eye contact, immediately flush with copious amounts of water for at least 15 minutes. Do not take internally. If swallowed, do not induce vomiting. Call a physician immediately. Dispose of in an environmentally safe manner. Read Material Safety Data Sheets before using this product.

Spray equipment should be cleaned with clean water.

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