CEM Polyure FC-45 Concrete Crack & Spall Repair

What Is CEM Polyure FC-45 Concrete Crack Repair?

CEM Polyure FC-45 Concrete Crack Repair is a two-component, low-viscosity, solvent-based polyurethane used to repair non-moving horizontal cracks and other surface defects in concrete. Its fluid consistency allows it to penetrate narrow cracks while filling spalls, pop-outs, holes, gouges, and similar surface imperfections before the surface is ground, polished, coated, or returned to service.

The product cures quickly after mixing, making it well suited to projects where concrete repairs must be completed before diamond grinding, concrete polishing, or the application of coatings and other surface treatments. It can also be used as a pit grout during the concrete polishing process and accepts CEM Color Packs when color matching exposed aggregate is required. CEM Polyure FC-45 is intended for non-moving concrete repairs. Before applying the product, confirm that the crack is non-moving and follow the manufacturer's application recommendations.

What Types of Concrete Damage Can It Repair?

CEM Polyure FC-45 is intended for repairing non-moving horizontal concrete defects, including:

• Cracks
• Spalls
• Pop-outs
• Surface pits
• Holes
• Gouges
• Minor surface voids

Do not use it for moving cracks, expansion joints, or structural repairs. Follow the manufacturer’s instructions for the size and condition of the repair.

Is CEM Polyure FC-45 the Right Choice for Your Project?

Key Benefits

• Low viscosity: Flows into narrow cracks and small surface defects.
• Fast setting: Supports repairs where short turnaround times matter.
• 1:1 mixing by volume: Uses equal volumes of Part A and Part B.
• Tintable: Accepts CEM Color Packs for color-matched repairs.
• Can be diamond ground: Allows finishing after the repair reaches the required hardness.

Technical Specifications

Review the manufacturer's published specifications to confirm that CEM Polyure FC-45 matches your project requirements and application conditions.

* Grind time and return-to-traffic time vary with temperature, humidity, concrete condition, and job site conditions. Always refer to the manufacturer's Technical Data Sheet (TDS) for complete application instructions, limitations, and performance information.

How Much CEM Polyure FC-45 Do You Need?

The amount needed depends on the width, depth, and total length of the cracks. Spalls, holes, and hidden voids require additional material.

Measure the damaged areas before ordering. For larger repairs, follow the manufacturer’s repair instructions. Contact our team if you need help estimating how much to buy.

Application Overview

CEM Polyure FC-45 is intended for non-moving horizontal cracks and other suitable concrete surface defects.

1. Prepare the repair area. Remove dust, debris, and loose material. Follow the manufacturer’s surface preparation and dryness requirements.
2. Measure and mix. Combine Part A and Part B at a 1:1 ratio by volume. Follow the manufacturer’s mixing method and duration.
3. Place the material promptly. Mix only what you can apply within the manufacturer’s stated working time, then fill the prepared repair area.
4. Check requirements for larger repairs. Before filling larger spalls, holes, or voids, confirm the manufacturer’s size limits and whether aggregate is needed.
5. Allow the repair to harden. Follow the manufacturer’s waiting times before grinding, applying a coating, or returning the surface to traffic.

Read the current Technical Data Sheet and the Safety Data Sheets for Parts A and B before use. This overview does not replace the complete application and safety instructions.

Safety & Handling

For industrial use only. Read the product labels and Safety Data Sheets for Part A and Part B before handling, mixing, or applying CEM Polyure FC-45.

• Ventilation: Provide adequate ventilation or local exhaust. Avoid breathing vapors, mist, or spray. Use respiratory protection as required by the SDS.
• Protective equipment: Wear chemical-resistant gloves, protective clothing, and eye and face protection as specified in both safety sheets. Avoid skin and eye contact.
• Fire precautions: Keep away from heat, sparks, open flames, and hot surfaces. Do not smoke.
• Storage: Keep containers tightly closed in a cool, well-ventilated, secure area. Keep away from incompatible materials identified in the SDS.
• After handling and disposal: Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Do not discharge product waste into drains. Follow applicable disposal requirements.

Part B may cause allergic skin reactions and allergy or asthma symptoms if inhaled. Refer to both safety sheets for complete handling, first-aid, and emergency instructions.

Product Documents

Download the manufacturer's technical and safety documents for CEM Polyure FC-45 below. These documents contain detailed application, performance, and safety information.

Technical Data Sheet (TDS)

Contains product specifications, surface preparation requirements, mixing instructions, application guidance, curing information, limitations, and recommended uses.

Safety Data Sheet (SDS) Part A

Contains safety information for Part A, including handling, storage, personal protective equipment (PPE), first-aid measures, and emergency procedures. 

Safety Data Sheet (SDS) Part B

Contains safety information for Part B, including handling, storage, personal protective equipment (PPE), first-aid measures, and emergency procedures.  

Frequently Asked Questions

Can CEM Polyure FC-45 repair moving cracks?

No. CEM Polyure FC-45 is intended for repairing non-moving horizontal cracks and other stable concrete surface defects. If the damage involves movement, expansion joints, or structural cracking, select a repair product that's specifically recommended for those conditions.

Can CEM Polyure FC-45 be used outdoors?

Yes, provided the application matches the manufacturer's recommendations. Review the Technical Data Sheet (TDS) before use, especially if the repaired area will be exposed to prolonged UV exposure or demanding environmental conditions.

How soon can I diamond grind the repaired area?

Under normal conditions, the repaired area can typically be diamond ground in as little as 15 minutes, or once the material has fully hardened. Actual curing time varies with temperature, humidity, and job site conditions.

How soon can the repaired surface return to traffic?

Under normal conditions of 72°F (22°C) and 50% relative humidity, repaired areas typically return to heavy foot or vehicle traffic in about one hour. Cooler temperatures, higher humidity, and site conditions may extend curing time.

Does CEM Polyure FC-45 require a primer?

No. CEM Polyure FC-45 is applied without a separate primer, reducing preparation time before the repair begins. Prepare the concrete surface according to the manufacturer's recommendations before application.

Can I add color to CEM Polyure FC-45?

Yes. CEM Polyure FC-45 accepts CEM Color Packs, allowing the repair material to be tinted when blending repairs with exposed aggregate or surrounding concrete is preferred.

Can CEM Polyure FC-45 be used before concrete polishing?

Yes. CEM Polyure FC-45 is frequently used before diamond grinding and concrete polishing to repair cracks, surface pits, and other imperfections. It can also be used as a pit grout where UV stability is not required.

Is CEM Polyure FC-45 compatible with decorative coatings?

Yes, when the coating manufacturer recommends its use over properly repaired concrete. Verify compatibility and follow the recommended surface preparation requirements before applying epoxy, polyurethane, or other decorative coating systems. Explore more professional-grade decorative concrete products on The Decorative Concrete Store for concrete repair, surface preparation, decorative coatings, concrete sealers, and concrete polishing projects.