Bondex

Surface Preparation
Thorough substrate preparation is essential.
Recommended methods are:
For floor screeds – remove all weak or loose material and provide a mechanical key to smooth concrete by means of scabbling or shot-blasting. If this is not possible, chemically etch the floor with Polycote Etch IT followed by thorough rinsing.
The abrasive effect of jet washing can assist in preparation and is recommended where appropriate. Ensure the surface is clean and free of loose material, oil or grease. Degrease if necessary using Polycote Degrease IT followed by thorough rinsing.
For patch repairs – concrete repairs should be prepared with squared off edges having a 6mm vertical lip.
Remove all loose material – wire brushing is advisable.
Remove any oil contamination from the surface using a gas torch and/or Polycote Degrease IT.
Expose any reinforcing steel and clean any rust back to bright metal, then prime with Bondex.
For porous surface prime with neat Bondex.
Mixing (Bondex Sand & Cement Mixes)
The standard mixing ratio for screeds or patch repairs is 25kgs cement and 75kgs sharp sand per 5L unit of Bondex. Water may be added to the mix to achieve the desired consistency.
Having primed the area, place the Bondex/Sand/Cement mix by trowel before the primer has dried.
Allow INITIAL cure before finishing the surface with a steel trowel – if this is attempted too early, surface crazing may occur.
Application Temperature
Bondex mixes should not be applied below 5°C.
Application Thickness
The recommended thickness range for Bondex-based sand/cement is 6mm minimum to 40mm maximum in one layer.