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Packaging:
5 gallon, re-closable plastic pails

Sikagard® 670W
Water dispersed, acrylic, protective, anti-carbonation coating

 

Description

Sikagard® 670W is a water dispersed colored, acrylic, protective coating. Sikagard® 670W prevents moisture ingress, is water vapor permeable and provides an excellent carbonation barrier.

Where to Use

Above grade, exterior application on buildings or civil engineering structures. It is designed to aes- thetically enhance and protect concrete and other masonry substrates subject to normal hydrothermal movement.

Advantages

  • Easy to apply.
  • Extremely resistant to dirt pick-up and mildew.
  • Excellent resistance to carbon dioxide and other aggressive gas diffusion.
  • Excellent UV resistance.
  • Excellent weathering resistance.
  • Prevents ingress of chlorides.
  • Cost effective protection.
  • Vapor permeable; allows each way water vapor diffusion (breathable).

Coverage

Theoretical per coat: 300 ft²/gal. Wet film thickness: 5 mils. Dry film thickness: 2.5 mils. Normal coating system is two coats minimum at a total nominal dry film thickness of 5 mils. Consumption is obviously dependent on substrate. In addition, allowance must be made for surface profile, variations in applied film thickness, loss and waste. A third coat may be necessary where opacity is reduced through thinning of the first coat, on dense substrates or with very bright color shades.

 

How to Use

Surface Preperation

All surfaces to be coated must be clean, dry, laitance free, sound and frost-free with curing compound residues and any other contaminants removed. An open textured sandpaper-like surface is ideal (CSP-3). Where necessary, surfaces should be prepared mechanically by blast cleaning or high pressure water- jetting. Allow adequate time for drying. Bugholes, cracks or irregularities of substrate should be filled and leveled with SikaTop® , Sika® MonoTop® leveling mortar or Sikagard® Surface Fillers as appropriate.

Priming All porous areas or concrete with excessive porosity should be primed using Sikagard® 552W Primer or SikaLatexp® R to allow easy application of Sikagard® 670W.

Mixing

Stir thoroughly to ensure uniformity using a low speed (400-600 rpm) drill and Sika paddle. To minimize color variation when using multiple batches, blend two batches of Sikagard® 670W. Use one pail and maintain the second pail to repeat this procedure (boxing) for the entire application.

Application

Any areas of glass or other surfaces should be masked. Recommended application temperatures (ambient and substrate) 45°-95°F (5°-35°C). Sikagard® 670W can be applied by brush, roller, or spray over entire area moving in one direction. Allow a minimum of 20-90 minutes prior to re-coating. At lower temperatures and high humidity, waiting time will be prolonged. At higher temperatures, work carefully to maintain a 'wet' edge. Sikagard® 670W is usually applied using a short nap lambs wool roller. Sikagard® 670W is particularly suitable for application by spray using the most standard spray painting equipment. As with all coatings, job site mock-ups should always be completed to confirm acceptability of workmanship and material.

Note: To achieve a dry film thickness of 4-6 mils., two uniform coats should be anticipated. On porous substrates, a third coat may be necessary and on particularly dense substrates, the first coat should be thinned 10% by volume with water. A third coat may then be needed for opacity.

Limitations

  • Do not use over moving cracks.
  • Substrate must be dry prior to the application.
  • Minimum age of concrete prior to the application is 14 days, depending on curing and drying conditions (moisture content must be below 5%).
  • Minimum age of SikaTop® or Sika® MonoTop® thin layer renderings is 3 days prior to the application of 670W (moisture content must be below 5%).
  • Sikagard® 670W should not be applied at relative humidities greater than 90%, or if rain is forecast within the specified rain resistance period.
  • Allow sufficient time for the substrate to dry after rain or other inclement conditions.
  • Product must be protected from freezing. If frozen, discard.
  • Not designed for use as a vehicular traffic bearing surface.
  • During application, regular monitoring of wet film thickness and material consumption is advised to ensure that the correct layer thickness is achieved.
  • When over-coating existing coatings, compatibility and adhesion testing is recommended.
  • Do not store Sikagard® 670W in direct sunlight for prolonged periods.