CHEM-PRIME

APPLICATION

Limitations:

Consumption: It is recommended to apply CHEM-PRIME at a rate of approximately 160 to 240 ft² / Gal (4 to 6 m² / Liter). This coverage may slightly vary depending on the substrate condition.

Surface Preparation:

New Concrete Surface: New concrete or cementitious substrates should be at least 28 days old and moisture content of the substrate should be less than 5%.

Concrete to receive high performance over lay systems should be designed, mixed and placed in accordance with internationally accepted practice.  Sufficient compressive and tensile strengths to withstand dynamic loading is required.  Good surface is essential, too dense surface caused by over trowel ling or finishing with steel floats can lead to adhesion failure.

All laitance and loose materials must be removed from the concrete surfaces.  If the concrete is good, crack-free and sound with light laitance, surface preparation may be achieved by acid etching followed by thorough water washing using high pressure water jetting ensuring all traces of acids are removed. Areas or deeply penetrating contaminations by oil, greases and fats should be flame cleaned by hot compressed air or thoroughly washed by good industrial detergent. The cleanly washed substrate is then allowed to dry completely.

Cracked or damaged concrete or heavy laitance should be removed and prepared by grit blasting, scabbling or mechanical grinding until a solid surface is reached showing exposed aggregate.

On Existing Concrete Surfaces: Remove all surface laitance, loose particles, dust and   all    contaminations exposing a clean sound substrate. Mechanical means of preparations are preferred followed by industrial vacuum cleaning. In areas of deeply penetrating contaminations of oils, greases and fats should be cleaned by hot compressed air or thoroughly washed by good industrial detergent.

The cleanly washed substrate is then allowed to dry completely.  The substrate can be considered sufficiently dry only when the relative humidity at the surface falls to 75% or less when measured with a hygrometer to BS 8201:1987 Appendix A.

Product Preparation: prior to application, the product should be stored under cover in dry conditions and protected from extremes of temperature, which may cause inconsistent workability, finish and curing times of the mixed material.   Ideally, at least 24 hours before mixing, the product should be maintained at approximately 77°F (25°).

Mixing: CHEM-PRIME is supplied it two pre-weighed parts resin and hardener. No additions or omissions are required. Stir each part separately. Pour part B (hardener) into the container of part A (resin).  Mix both parts using slow speed hand drill fitted with a mixing paddle attachment.  Carefully scrape the sides and bottom of the pail during mixing. Blend for 1 to 2 minutes until achieving a uniform color and consistency.  Mixed epoxy must be processed within the pot life. Mixed epoxy will cure much faster in hot weather. Large batches of mixed epoxy will cure much faster than small batches. Always keep the mixing time the same for all batches to ensure a uniform consistency when the product is applied.

Application: the mixture of CHEM-PRIME is applied evenly across the whole surface with a short bristled paintbrush or roller.  Work well with paintbrush in areas where concrete is porous and rough, ensuring all the area is primed.   Avoid over application or puddles.

• Epoxy Mortar Screed, epoxy overlays, should be applied immediately whilst the CHEM-PRIME is still tacky (at least within the specified pot life). If the primer hardens, re-prime the surface within 24 hours.
• Applicator can walk on wet primed substrate with the aid of spiked shoes to overlay primed surfaces with epoxy screeds.

Cleaning: remove uncured CHEM-PRIME from tools and equipment with suitable solvents such as Xylene, Toluene or CHEM-CRETE BLENDED SOLVENT immediately after use. Cured material may only be removed mechanically.