CHEM-NOVOLAC

APPLICATION

Limitations: Do not apply when temperature is below 10°C (50°F).

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 overlay 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 concrete’s surface caused by over trowelling 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 strong, 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. Cracked or damaged concrete or heavy laitance should be removed and prepared by grit blasting, scrabbling or mechanical grinding until a solid surface is reached showing exposed aggregate.

Existing Concrete Surfaces: remove all surface laitance, loose particles, dust and all contaminations exposing a clean sound substrate.  Mechanical means of preparation is preferred followed by industrial vacuum cleaning. In areas of deeply penetrating contaminations by oils, 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. Un-even concrete surfaces should be leveled to produce a smooth flat surface using an appropriate epoxy repair mortar technique. Expansion, control and isolation joints in concrete substrates should be maintained through the epoxy system and filled with an appropriate sealant.

Steel: the base metal should be free from rust, scales grease, oil, and any other impurities, which impairs the strong adhesion of coating.

Corroded steel should be shot blasted to Swedish Standard SA 2½ achieving bright metal surface.

Where shot blasting is impractical, pre-treatment may be carried out using needle guns, tap hammers, rotary wire brushes fitted to grinder or drill, mechanical grinding, etc. Cleaning with solvent is advisable to ensure surface is free from grease or oil.

The coating work should be carried out immediately or at maximum 2 hours after pre-treatment of steel surfaces.

CHEM-NOVOLAC is applied on steel at 8 mils (200 microns) dry film thickness per application. This is equivalent to coverage rate of 200 ft² (18.60 m²) per gallon.

Mixing: should be stored under cover in dry conditions and protected from extremes of temperature Prior to application, the product, extremes of temperature may cause inconsistent workability, finish and cure times of the mixed material.   Ideally, at least 24 hours before mixing, the product should be maintained at approximately 68°F (20°C).

Mechanical mixing of both components part A and part B is the most efficient and effective method.

Mix thoroughly, three parts by volume of part A with one part by volume of part B, make sure to scrape the sides and bottom with a slow speed electric drill fitted with a mixing paddle. Do not mix more material than can be applied in 30 minutes. Ensure a smooth uniform homogenous color mixture.

Application as a Protective Coating: it is recommended to apply CHEM-NOVOLAC in two coats applications.

First coat: apply the first coat of CHEM-NOVOLAC onto the pre-treated dry substrate using a good quality paintbrush or roller. Spread the mixture to an even and smooth finish free from streaks of brush or roller marks. Allow the first coat to cure overnight.

Second coat: the second coat of CHEM-NOVOLAC should be installed on the cured first coat within 24 hours of first coat application. Should there be any delay in application of second coat longer than 24 hours, the surface must first be roughened up by a light brush, blasting or by sandpaper, this process will ensure a good mechanical bond between the two coats. Second coat should be installed in the same procedure as in first coat. Make a neat smooth even finishing of second coat.

Thickness of the coating may vary according to the desired specification of dry film thickness from 400 microns to 800 microns.

Application as Epoxy Mortar Screed:

Primer: the substrate can be primed with Chem-Prime, apply at a minimum of 200 ft² (18.6 m²) per gallon (8 mils dry film thickness). Primer should be tack free before applying base coat.

Mortar: prepare the mortar system by adding 5 parts by weight of silica sand (0.1-0.3 mm and 0.4-0.8 mm mixture) to one part by weight of CHEM-NOVOLAC. Blend the mortar until achieving a uniform homogenous consistency.

Screed CHEM-NOVOLAC mortar onto the primed area, rake to distribute then compact well and trowel to finish. When used as a Mortar screed, it is recommended that one or two top coats of CHEM-NOVOLAC be applied to seal the surface against chemicals and acids attacks.

Curing:  Allow the coating system to cure for minimum of 24 hours before allowing its use for light foot traffic. Heavy traffic and chemicals should not be allowed until after 72 hours.

Cleaning: remove uncured CHEM-NOVOLAC 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.