Plastic Cement

    13 Plastic Cement

    Available in:  5 gallon pails

    KARNAK 13 Plastic Cement is a scientifically compounded composition of selected asphalts, mineral fillers and refined solvents that are manufactured to a heavy consistency for application by trowel to provide a durable, elastic coating of excellent adhesion and high resistance to water and weathering.

    This product, when applied dries to a tough, flexible, waterproof and corrosion proof coating, which gives excellent performance over wide ranges of temperature and weather conditions. KARNAK 13 Plastic Cement is available in 2 consistencies: Summer and Winter Grade.



    • Will not shrink or crack
    • Smooth, easy to apply rubber-like trowel consistency
    • Excellent adhesion
    • Excellent resistance to flow (sag) at high roof temperatures
    • Ready to apply – no mixing required
    • VOC: 253 g/L

    Coverage Calculator

    • 4-8 Gallons per 100sf**


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


    KARNAK 13 Plastic Cement is a general-purpose cement for repairing leaks in shingles, concrete, metal or asphalt roofs, flashings on walls, chimneys, flues, downspouts and cornices.  Excellent for sealing cracks in concrete, brick, as a joint filler for pre-cast roof slabs and general purpose use in maintenance of exposed buildings and structures.

    Physical Properties

    1. Consistency: A smooth, heavy trowel consistency that will readily spread on
    and adhere to most all surfaces without sagging.
    2. Character of Dried Film: Uniform, excellent adhesion to masonry, steel, slab
    insulation and other surfaces.
    3. The dried film retains its flexibility and ductility so that the coating will resist
    extreme variations in temperature and weather.
    4. Has excellent resistance to flow at high temperatures when used on a
    vertical surface.

    Preparation & Application

    All surfaces should be dry, clean and free from oil or grease, dust, dirt, loose paint
    or other foreign matter.

    Spread KARNAK 13 Plastic Cement to an average thickness of 1/8” (approximately
    8 gallons per square) and press tightly into joints, seams or cracks. To repair large
    cracks, breaks and blisters, spread KARNAK 13 Plastic Cement over the damaged
    area then embed KARNAK 34 Cotton, KARNAK 31 Fiberglass or KARNAK 3036 Polyester membrane reinforcement
    and then apply another layer of KARNAK 13 Plastic Cement over the entire patch.

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