FAQ – Stone Repair

Surface preparation is critical successful stone repair. Most natural stone is highly absorptive and must be thoroughly saturated (SSD) prior to placing the repair mortar.

  • Mix only as much material as can be placed in 15 – 20 minutes. Do not re-temper. Re-tempering can cause cracking and will affect the final color.


  • Use MIMIC and/or Matrix for the full depth  of the repair. Building out with another material  may cause damage to the substrate and  cracking of the repair mortar. Cracking of this  type occurs because of the difference in the  substrate materials (i.e. the material used  to build out and the existing stone).


  • The precise addition rate of water  is critical to maintaining consistent color.  Establish a consistent method for measuring  water and maintain it throughout the job.


  • In hot weather cure by misting with  water 2 – 3 times a day or use burlene.  Do not use curing agents or allow polyethylene  or burlap to touch the surface of the repair,  as this will cause whitening or changing of color.


  • Finishing technique will change the final color.  A smooth trowel finish will be lighter in color  than a shaved finish.


  • The texture of the repair mortar will be more rough the earlier it is shaved. Conversely, a fine finish is achieved by shaving late in the curing process. The more rough the texture the darker the color will appear. The more fine the texture the lighter the color will appear. The actual color of the product is not changing. It is the way light reflects off a texture that causes the difference.


Stone Repair and Preservation

Repair Mortars
Matrix (MIMIC)
Matrix TR (Mimic TR)