
KILZ Concrete Crack Filler, Gray, 3.4 LB
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Highlights
- FAST, EASY 3-STEP APPLICATION: Skip complicated prep—this dry powder formula requires no mixing. Simply apply, mist with water, and smooth for a clean, uniform finish.
- FILLS CRACKS UP TO 2 INCHES WIDE: Effectively repairs small hairline cracks to larger gaps in horizontal concrete surfaces, improving appearance and durability.
- NO MIXING, NO SHRINKAGE FORMULA: Innovative dry powder technology is water-activated, eliminating messy mixing and reducing shrinkage for long-lasting results.
- FAST DRYING & EASY TOUCH-UPS: Dries in as little as 1 hour for hairline cracks. Easily touch up if concrete shifts over time for continued protection and appearance.
- VERSATILE FOR MULTIPLE SURFACES: Ideal for patios, driveways, garage floors, pool decks, walkways, and basement floors. Can be left uncoated or used with concrete floor coatings such as KILZ Porch & Patio Floor Paint, KILZ 1-Part Garage Floor Paint, KILZ Decorative Concrete Coating and KILZ Over Armor Solid-Coating.
Why You'll Love It
- Water-activated dry powder requires no prior mixing and reduces shrinkage
- Fills hairline fractures all the way up to 2-inch wide horizontal gaps
- Simple three-step application of applying, misting with water, and smoothing out
- Fast drying action sets in as little as 1 hour for hairline cracks
- Works well on bare horizontal concrete or under specialized floor paints
Pros
- +No messy mixing required
- +Dries in 1 hour for hairline cracks
- +Fills cracks up to 2 inches wide
- +No-shrinkage dry powder formula
- +Compatible with concrete floor coatings
Cons
- -Designed only for horizontal surfaces
- -Requires water misting to activate
Detailed Review
KILZ Concrete Crack Filler provides a straightforward way to repair damaged horizontal concrete around the home. Designed for driveways, patios, walkways, garage floors, basement slabs, and pool decks, this gray repair material restores damaged surfaces without requiring complex preparation or messy liquid mixing.
The dry powder formula simplifies repairs down to three steps: apply the dry material into the damaged area, mist it with water to activate it, and smooth it out for a uniform finish. Because the water activation eliminates shrinkage, the repair holds its volume across cracks ranging from tiny hairline fractures up to gaps measuring 2 inches wide. For minor hairline cracks, the filler dries in as little as 1 hour.
This filler functions well on its own as an uncoated surface repair, but it also pairs directly with dedicated concrete paints. If you plan to paint the entire slab, it is fully compatible with KILZ Porch & Patio Floor Paint, KILZ 1-Part Garage Floor Paint, KILZ Decorative Concrete Coating, and KILZ Over Armor Solid-Coating.
Keep in mind that this product is intended strictly for horizontal concrete surfaces, so it is not designed for vertical walls. The listing also focuses on concrete, meaning it is not specified for other masonry materials, and drying times for wider 2-inch gaps are not detailed beyond the 1-hour hairline benchmark.
Verdict: This crack filler is a practical, mess-free choice for homeowners looking to patch horizontal outdoor or indoor concrete without mixing buckets of compound. It is ideal if you want a quick-drying repair that can remain bare or sit under topcoat paints.
Who Should Buy It
A great fit if you:
- Need to repair horizontal cracks up to 2 inches wide in driveways, patios, or garage floors
- Want a fast three-step process that skips manual bucket mixing
- Plan to paint over repaired concrete with KILZ floor coatings
- Need a quick 1-hour dry time for minor hairline cracks
Consider something else if you:
- Need to repair vertical concrete walls or foundations
- Prefer a pre-mixed liquid paste rather than a water-misted powder
FAQ
How do you apply this crack filler?
It uses a 3-step application: apply the dry powder directly to the crack, mist it with water to activate the formula, and smooth it out for a clean finish.
How long does it take to dry?
It dries in as little as 1 hour for hairline cracks.
Can I paint over this concrete filler?
Yes, it can be left uncoated or topped with coatings like KILZ Porch & Patio Floor Paint, KILZ 1-Part Garage Floor Paint, KILZ Decorative Concrete Coating, and KILZ Over Armor Solid-Coating.
Product Details
| ASIN | B0GWNBNS2Z |






