Sikaflex Self-Leveling Sealant 29 oz, Sandstone, ASTM C920 Class 25

Joint Limits, and They Are Not Suggestions

Getting the joint geometry wrong is the most common way a good sealant fails. Sika publishes hard limits and a required width to depth ratio, and a backer rod or bond breaker tape is mandatory on horizontal joints so the sealant bonds to two faces and not three.

Coverage per 29 oz Cartridge

Specifications

Where Sika Says Not to Use It

• Not for sloped surfaces. It is self leveling. On a slope it runs.
• Not in contact with bituminous or asphaltic materials.
• Do not cure it near curing silicone sealants.
• Not where moisture vapour is coming up through the slab. It bubbles.
• Do not apply above 100 F. In extreme heat, install as temperatures are falling.
• Avoid alcohol and solvent cleaners during cure, and avoid silicone or high solvent paints over it.
• Maximum chlorine exposure 5 ppm, which matters around pool decks.
• Use an opened cartridge the same day.

Timing on New and Cut Concrete

• Green concrete can be sealed 24 hours after it has cured, though adhesion may suffer on low strength concrete.
• Where joints are formed, remove the forms 6 hours before sealing.
• Where joints are saw cut, cut them 8 hours before sealing.
• Install when the joint is at the middle of its expected movement range, not at its widest or narrowest.
• Allow a week before total water immersion or painting.

The manufacturer's technical data sheet (coverage, joint width, cure and rain-safe times) and safety data sheet are collected in the TDS and SDS library. Every figure on this page comes from those sheets.