Surface Preparation
Proper surface preparation is critically important for the long-term performance of the Dura-Coat Krete-Chemical 870. 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. Dura-Coat Krete- Chemical 870 can be applied on damp concrete without using Dura-Coat Krete-Seal 800. 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
Thoroughly mix Activator into Base with mixing stick or drill with low-speed mixing blade scraping sides and bottom of container or mixing board. Mix by weight 1-part Base to 1-part Activator. Mix thoroughly to produce an even colored and streak-free material. THINNING: Never thin.

Application
Application temperature range 10°C (50°F)-32°C (90°F) (substrate).
Dura-Coat Krete-Chemical 870 may be applied by notched squeegee, spray system, brush, or roller.
Brush: medium to stiff bristle of sufficient quality that bristles do not pull out and stick in coating (epoxy glued bristles are best). Trim or tape to <1” nap.
Roller: use good quality 1/8” nap.
For maximum protection against immersion or spills, a 2-coat system is recommended.
To avoid sagging on vertical surfaces the maximum wet film thickness should be between 500 μm-1000 μm (20-40 mil) per coat.