Sika® Primer-173

Sika® Primer-173 is a solution of isocyanate adhesion promoters in an organic solvent.

2 years when properly stored

Store in unopened containers in a cool, dry area out of direct sunlight.

65°F (18°C)

35% by volume

90 cps

35–40 ft2/pt (6.87–7.86 m2/L)
450 linear ft (137 m) for
1/2" (13 mm) deep joint

• Substrates such as copper, stainless, and galvanized steel typically require the use of a primer; Sika® Primer-173 or Sika® Primer-176 is acceptable. For Kynar 500-based coatings, use Sika® Primer-173 only. An adhesion test is recommended for any other questionable substrate.
• Be careful to apply Sika® Primer-173 only to joint faces; Sika® Primer-173 will darken upon UV exposure.
• Proper application is the responsibility of the user. Field visits by Sika personnel are for the purpose of making technical recommendations only and not for supervising or providing quality control on the job site.

1. Masonry surfaces must be sound, clean, dry, and free of all paint, grease, oil, dirt, and foreign matter.
2. Concrete surfaces must be fully cured and free of laitance, moisture, or form oils.
3. Where necessary, clean joint surfaces by grinding, sandblasting, or mechanical abrading; remove dust, dirt, and loose particles before priming.
4. Metal-edged joint surfaces must be clean and free of all rust, oil, and dirt.

Do not apply to backer rod

1. Apply Sika® Primer-173 to the cleaned joint surfaces by brushing on a thin, uniform coat. Use primer as is; do not thin. Too much primer may act as a bond breaker.
2. Allow primer to dry tack-free before applying sealant. Dry time will vary depending on temperature and humidity.
3. Sealant must be applied the same day as primer.
      

Drying Time

15 minutes at 70 °F (21 °C) and 50% humidity

Brushes and tools may be cleaned with SikaSwell®-990 before primer has dried. Dried primer must be removed by abrading.