Surface Preparation
Proper surface preparation is critically important for the long-term performance of the Dura-Coat Chemical Mortar 840. The prepared concrete surface must be structurally sound, free from all contaminants and roughened to an >ICRI CSP 3 profile (similar to #60 grit sandpaper). If using with Dura-Coat Krete-Seal 800, surface may be damp, but not wet i.e. no free-standing water. A vapor barrier (Krete-Seal 800) is required for slab on grade application. If no vapor barrier is present, check for vapor transmission.

Surface Cleaning & Profiling Methods
Hydro-Blasting                  Scarifying
Steel Shot-Blasting           Dry Abrasive Blasting

Mixing
To facilitate ease of mixing and application, all material temperatures should be between 21°-32°C (70°-90°F) prior to mixing. Chemical Mortar 840 should be applied shortly after application of Krete-Seal 800 primer. The primer must still be tacky prior to applying Chemical Mortar 840; otherwise the area must be reprised. This is optimally within 2 hours of application, depending on ambient conditions. Premix the Base to disperse pigments. Thoroughly mix Base and Activator in a suitable pail, using a slow speed mixer.
Next, transfer the blended resins to an epoxy mortar mixer containing one bag of Quartz and gradually add in remaining bags. Total mixing time should be a minimum of 3 minutes or until uniformly blended.

Application
The mixed Chemical Mortar 840 may be distributed on the floor surface using screed guides and rigid bar, or screed box, not exceeding 1.2 m (3.93 ft) wide.
• Apply a minimum of 6 mm (240 mil) and finish the surface using steel trowels.
• IMPORTANT: During application, press Chemical Mortar 840 firmly on to the substrate to promote contact with the primer and to ensure thorough compaction. Trowel-finish the surface to a smooth closed surface texture.