Tremco SX300-NA Self Priming Smoothing Compound

Tremco SX300-NA Self Priming Smoothing Compound


SX300 NA is a two part general purpose smoothing underlayment for interior applications. SX300 NA is specifically designed for the preparation and smoothing of interior subfloors prior to the application of a liquid applied damp proof membrane and receiving a floor covering.

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    What the experts have to say

    SX300 NA should be applied directly after mixing by pouring a ribbon of material along the wet edge and then trowelled to form a smooth, even finish. The effective use of spike rolling can reduce visible trowel marks.
    • Water resistant: can be used for pre-smoothing

    • Short setting and cure time, facilitating fast track programs and minimising disruption

    • Low odor and protein free

    • Self-priming on most surfaces

    • Excellent adhesion to a wide range of common flooring substrates, including: concrete, sand/cement screeds, flooring grade asphalt, TREMCO surface DPM’s, etc.

    Cementitious powder and liquid latex dispersion
    Pot Life (at 20°C):
    20 minutes
    Compressive Strength:
    After 28 days approx. 21.9 N/mm²
    Tensile Strength:
    28 days 1.4 N/mm²
    An average thickness of 3 mm will provide a coverage rate of 5 m² per mix.
    Cure Time (at 20°C):
    Between 2 - 4 hours for foot traffic and 8 - 12 hours for application of damp proof membrane, floor covering and loading
    Store in dry, shaded conditions between +10°C and +35°C
    Shelf Life:
    6 months when stored as recommended in original unopened packaging. High temperatures and humidity will lead to a reduced shelf life
    Full Information:
    Check out the full datasheet available in the Downloads section!

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