Sikaflex Self-Leveling / Crack Flex Sealant (10.1 oz) Review (2026)
By The DIYPicks Team · Updated July 2026
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- Concrete cracks
- Driveway cracks
- Horizontal joints
The best DIY fix for horizontal cracks in driveways, patios, and garage slabs. It flows in, self-levels, and stays flexible so the crack does not simply reopen next winter.
Pros
- Self-levels into the crack for a smooth flush finish with no tooling required
- Cured polyurethane stays flexible and moves with the slab, resisting re-cracking better than rigid fillers
- Bonds without a primer to concrete and cures gray, blending into most driveways and slabs
Cons
- Self-leveling only works on horizontal surfaces; vertical or wall cracks need a non-sag product
- Deep or wide cracks need backer rod or sand first, or the tube empties fast
- Full cure takes several days, so keep traffic off the repair longer than a fast-set filler
Specifications
| Type | Single-component self-leveling polyurethane |
|---|---|
| Expansion | N/A (self-leveling, flows into crack) |
| Cure | Tack-free in a few hours, full cure in ~3-7 days |
| Paintable | Yes, sandable and paintable |
| Use | Horizontal concrete cracks up to ~1-1.5 in wide |