Shop|Stone Repair & Mastics|St Astier St One Step Repair

St Astier St One Step Repair

From£6.00 + VAT

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colour swatch for St Astier St One Step Repair colour swatch for St Astier St One Step Repair

St Astier St One Step Repair

From£6.00 + VAT
St Astier St One Step and Flagstone Repair
Product Name

St Astier St One Step and Flagstone Repair

St Astier One Step and Flagstone Repair is based on Saint-Astier® lime, with specific aggregate and additives.  ST.ONE® (Formally Lithomex) Flagstone is a ready-to-mix mineral mortar specially designed for surface repairs of flagstone and steps.  It’s easy to model, form and shape.  


Specially formulated mortar based on Natural Hydraulic Lime and aggregates for the repair of flagstones and steps to simulate stone. It is a neutral white or pre coloured mortar supplied in 25KG bags to which water is added.

Mixing and use:

Can be mixed manually or mechanically by whisk, adding up to 180ml water per kilogram of St.One ® used. Mix well for 3-5 minutes. The application surface must be clean, free from dust and oils. On porous surfaces, ensure that suction is controlled by pre-wetting and apply St.One ® before this is fully dry. Never apply to surfaces that are over saturated or have standing water.

The minimum thickness is 5mm but St One can be cut back to a feather edge. The maximum thickness in 1 pass is 40mm. In cases where a thickness of more than 40mm is required, apply in layers of a maximum of 40mm, each one approximately 24 hours apart. Always dampen application areas. The mortar should be well pressed back in place. If required re-compact by pressing after a couple of hours to avoid possible shrinkage marks due to suction from the background. In some instances support of the fresh mortar is required by using wires, anchorages, stainless steel fixings, etc

Shaping and forming of details can be carried out for up to 1 week after placing by scraping to profile or level with metal tools, such as the edge of a trowel or steel float however most shaping and finishing work can be done within 24 hours.

Available in 24 Colours 

Please add colour to comments box at checkout

Due to the use of natural materials in our products there is often some slight variation between colours and batches. Whilst mortars are made to the same recipe you can get differences in colour.

We always recommend you do a test area to ensure a good match