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Prompt Natural Cement

Fast Setting, waterproof and saltwater resistant Natural Cement

Prompt is a very simple material which boasts some impressive credentials, ideally suited for marine applications, rapid-set masonry and as a replacement for Roman Cement, and can also be gauged with Natural Hydraulic Limes to provide an early false set to protect the mortar as it cures.

Prompt a completely natural and incredibly fast setting cement, controllable from just ninety seconds to one hour. It is waterproof and approved for use with drinking water, can be mixed with sea water and is resistant to chemicals, acids and alkalis, and has an exceptional shelf life.

Cornish Lime is the national distributor for Prompt, produced by the Vicat Company at their Voreppe works very close to the French alpine city of Grenoble. The Vicat Company was established in 1853 and is the third largest cement producer in France, and now the only manufacturer of Natural Cement sold as Prompt, a name as synonymous with natural cements as Hoover is for vacuum cleaners.


  1. Tempo

    Retards the setting time for Prompt Natural Cement. Adjustable from 90 seconds up to an hour depending on conditions. Tempo adjusts the setting time of prompt from around 2 minutes to 15 minutes at 20 degrees C.

    £1.82
    Incl. VAT: £2.18
  2. Prompt Natural Cement - 25kg

    Prompt natural cement is an incredibly fast setting cement (controllable from just ninety seconds!).

    £15.87
    Incl. VAT: £19.04
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