GCF – Fast-Setting Polyurethane Concrete Crack Filler (1-Gallon Bulk Kit)
GCF is a fast-setting, two-component polyurethane crack filler designed for structural concrete repair in industrial, commercial, and large-scale residential applications. Supplied in a cost-effective 1-gallon bulk kit, GCF offers contractor-grade performance at exceptional value, delivering a large volume of material at a highly competitive price.
With its ultra-low viscosity and rapid cure profile, GCF penetrates deeply into cracks and voids — forming a strong, permanent bond to concrete. Ideal for everything from hairline cracks to deep surface spalls, it can be applied neat or used in combination with clean, dry sand for patching larger damaged areas.
Note: This product is intended for manual application. Applicator tools or injectors are not included.
Key Benefits
- Bulk 1-Gallon Kit: Includes 0.5 gal Part A + 0.5 gal Part B
- Exceptional Value: Large quantity at a discounted, contractor-grade price
- Rapid Set Time: Walkable in 15–20 minutes; heavy traffic ready in under 1 hour
- Deep Penetration: Low viscosity (< 30 cps) ensures strong mechanical bonding
- High Bond Strength: Up to 3,800 psi neat or 9,000 psi with sand
- Versatile Use: Apply neat for small cracks or blend with sand for larger voids
- Excellent Durability: Resistant to abrasion, impact, and heavy loads
- Solvent-Free: Nearly 100% solids, low VOC (5.5 g/L)
Application Instructions
Hairline and Small Cracks
- Grind open the crack to expose pores and remove contaminants.
- Vacuum or wire brush to eliminate dust and loose debris.
- Mix Part A and Part B (1:1 by volume) for ~10 seconds (small batch).
- Pour neat into the crack and allow to self-level.
Larger Cracks, Voids, and Spalls
Option 1: Sand Pre-Fill Method
- Grind and clean the repair area.
- Fill tightly with clean, dry sand and level flush.
- Mix and pour GCF until fully saturated.
Option 2: Sand-Blend Method
- Mix GCF with sand to a trowelable paste.
- Spackle or pack into the patch before it sets.
Important: Working time is 1–3 minutes. Mix only what you can apply immediately.
Usage Guidelines
- Always grind cracks to open pores and improve adhesion.
- Apply only to clean, dry concrete.
- Not for use in expansion joints.
- Product may discolor in UV or sodium vapor lighting conditions.
- Store between 55°F and 85°F. Allow additional cure time in cold temperatures.
Technical Details
- Mix Ratio: 1:1 by volume
- Pot Life: 1–3 minutes
- Compressive Strength: 4,400 psi (with sand)
- Bond Strength: 3,800 psi neat, 9,000 psi with sand
- Tensile Strength: 4,500 psi
- Shore D Hardness: 71
- VOC: 5.5 g/L
- Shelf Life: 12 months unopened
- Color: Gray when cured
- Coverage: Varies based on crack size and aggregate use
Finishing Note
GCF is a high-performance structural repair material. It is not color-matched or intended as a decorative finish. To achieve a uniform appearance after crack repair, we recommend applying GlobMarble Multi-Pro Overlay over the cured area.
