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  • Color : grey
  • Working time : 20min
  • Walk on time : 1,5-3h
  • Curing time : after 24h
  • Coverage : 1,7 kg/mm/ m²


  • Quick curing
  • 5–50 mm in one work step
  • High strength


Measure 5,4 liters of clean, cold water into a clean mixing bucket. Gradually add the bag of Bostik SL C940 XL to the water, whilst continually mixing with an electric drill and mixing paddle until a smooth lump-free mixture is obtained. This will normally be achieved after 2 minutes. The mixture will retain its self-smoothing capability for approximately 20 minutes under normal conditions. Pour the mixed material onto the prepared substrate to a thickness between 1mm and 50mm. Using a smooth edge stainless steel trowel, smooth over the wet product to gain the desired thickness and smoothness. A pin level may be used to assist in gaining the required depth. Use a spiked roller to remove any trapped air and flow lines, to give a uniform surface appearance.

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