Epoxy Crack Filler | 100% Solids Non Sag Gel for Cracks and Joints

Epoxy Crack Filler is a professional grade, 100% solids, two component (1 to 1) gel epoxy built for repairing cracks, joints, spalls, and surface defects in concrete. The non sag consistency is the entire point of the product. It goes exactly where you put it and it stays there, on the floor or on a wall.

Liquid repair resins have two failure modes. On a slab they disappear into the subgrade and you come back to fill the same crack twice. On a wall they run straight down and you chase them with a knife. This gel does neither. It bridges the void, holds the v groove, and gives you time to tool it flush before it sets.

This is the controlled repair. One application, tooled flush, ground smooth, coated over.

Where This Product Fits in Your System

• Floor Cracks and Spalls: Fills and holds without sinking into the slab, so one pass finishes the repair.
• Vertical Repairs: Wall stems, curbs, and pillars where a liquid filler would run before it set.
• Control Joints: Static contraction joints you need filled flush with the surrounding floor.
• Pre Coating Prep: Sealing cracks before a high build epoxy, flake, metallic, or polyaspartic system goes down.

Key Features and Benefits

• Non Sag Gel Formula: Holds on vertical surfaces without dripping, running, or slumping.
• Horizontal and Vertical: One product for the slab, the curb, and the wall instead of two.
• 100% Solids and Zero VOC: Solvent free with virtually no odor, so it works in occupied interiors, basements, and garages.
• 1 to 1 Mix Ratio: Equal parts by volume. Nothing to measure wrong on a jobsite.
• Superior Bond Strength: High mechanical properties built for industrial and commercial traffic.
• 30 Minutes of Working Time: Enough room to place and tool the repair properly, and ready to grind in 2 hours 30 minutes.
• Gray: Blends under a full flake or quartz broadcast and disappears under an opaque base coat. It does not accept pigment.
• Grinds Clean: Once cured it takes a diamond without gumming up, which is what lets you make the repair disappear.
• Excellent Compatibility: Coats over with any epoxy, urethane, or polyaspartic system we sell.

Why Professional Installers Use It

A liquid repair on a wide crack is a guessing game. You pour, it sinks, you come back, you pour again. Every trip costs material and labor, and the repair still ends up low.

This gel stays in the v groove. You press it in once, tool it flush, and move on. That is the whole economic argument, and it is why installers who switch to a gel do not go back to chasing liquid down a wall.

Mixing Instructions

• Mix Ratio: Combine 1 part Part A with 1 part Part B by volume.
• Mix Time: Mix thoroughly for a minimum of 3 minutes until the color is completely uniform.
• Technique: Scrape the sides and the bottom of the container. Unmixed material on the wall of the pail is unmixed material in your repair.
• Batch Size: Mix only what you can place and tool. A gel that starts to set in the container cannot be brought back.

Pro Note: Need a paste and already have epoxy on the shelf? LABTEC Thickening Agent turns any 100% solids epoxy into a filler on demand. Use this gel when you want the repair ready to go out of the bucket.

Application Guidelines

• Surface Prep: The crack must be clean, dry, and mechanically prepared. No primer required.
• Placement: Use a flat putty knife, a 6 inch broad knife, or a steel margin trowel to press the gel into the crack or spall.
• Finishing: Tool the material flush with the surrounding concrete while it is still workable. Time spent here saves grinding later.
• Grinding: Once the material is hard, grind or sand it flush with a diamond grinder for a seamless transition.
• Coating: Once the material is hard and ground smooth, the repair is ready for your primer or base coat.

Product Specifications

Cure times shift with slab and air temperature. Use the TDS for exact figures on your job.

Frequently Asked Questions

What makes this different from liquid crack repair?
This is a high viscosity gel. A liquid repair is designed to soak deep into a hairline crack. This gel is designed to bridge wider voids and hold on vertical surfaces without running or sinking.

Can I use this on walls?
Yes. The non sag formula was built for vertical work: wall stems, curbs, and pillars. It works just as well flat on the floor.

How fast can I coat over it?
Cure time varies with temperature. Once the material is hard to the touch and ground smooth, it is ready for your primer or base coat.

Is this compatible with polyaspartic topcoats?
Yes. Being 100% solids epoxy, it is a stable base for essentially all epoxy and polyaspartic coating systems.

Can this be sanded or ground?
Yes. Once cured it grinds cleanly without gumming up diamonds, which is what lets you create a seamless transition on the floor.

Is it safe for interior residential use?
Yes. Zero VOC and very low odor make it suitable for basements, garages, and occupied commercial interiors.

Can I color match this repair to my floor?
No. Epoxy Crack Filler is gray and does not accept pigment. That is not a problem under a full flake broadcast or an opaque base coat, where the repair disappears anyway. If you need the repair itself tinted to match the floor, use Crack and Joint Paste instead. It ships white and takes both solid color and metallic pigment.

How long is the working time?
30 minutes, and the repair is ready to grind in 2 hours 30 minutes. Both shift with slab and air temperature. Mix only what you can place and tool inside that window.

Do I need to prime the crack first?
No. This material bonds aggressively to clean, dry, mechanically profiled concrete without a separate primer.

What tool is best for applying this gel?
A stiff putty knife, a 6 inch broad knife, or a small steel margin trowel. Press the gel in rather than dragging it across.

Can I use this for expansion joints?
No. This is a rigid repair material. For a moving expansion joint you need a flexible filler. For static contraction joints, this gel is an excellent choice.

What is the shelf life?
Under normal storage in unopened containers, typically one year.

How much do I need?
Coverage depends entirely on how wide and deep the cracks are, so there is no useful square foot number. Measure your linear footage and estimate the void. A 2 gallon kit covers a great deal of hairline work and far less spall repair.

Technical Documents

Download the technical and safety data sheets for Epoxy Crack Filler below:

Technical Data Sheet (TDS)   |   Safety Data Sheet (SDS)