Sika® Primer-179

Sika® Primer-179 is an organosilane dissolved in an organic solvent.

15 months when properly stored

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

65°F (18°C)

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

• Sikaflex® HY 150/HY 100 is typically a non-priming sealant. Sika always recommends a field test application before the start of a project. Allow the sealant to cure for 10–14 days before testing, depending on humidity.
• Do not use Sika® Primer-179 on nonporous surfaces. Consult Technical Service for recommendations.
• Make certain the most current versions of the product data-sheet and SDS are being used.
• 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.
• Do not prime the backer rod.
• Do not prime metal or low porous substrates

1. Masonry and stone surfaces must be sound, clean, dry, and free of 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.

1. Apply Sika® Primer-179 to the cleaned joint surfaces by brushing on a thin, uniform coat. Make sure the primer does not soak into the substrate but forms a continuous film.
2. Use the primer as is; do not thin.
3. Too much primer may act as a bond breaker.
4. Allow the primer to dry tack-free before applying sealant. Dry time will vary depending on temperature and humidity.
5. Sealant must be applied the same day as primer.

Drying Time

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

Brushes and tools may be cleaned with SikaSwell®-990.