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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