Epoxy garage floor coating — a synthetic resin laid on top of concrete — can provide an attractive, durable finish for concrete floors. However, coatings can fail prematurely if the floor is not properly prepared before the coating is applied. Peeling and flaking are common problems that occur when the epoxy doesn’t adhere correctly to the concrete.

    With the right application techniques, you can avoid potential problems and enjoy long-lasting epoxy floor coating in your garage


    Why Epoxy Floor Coatings Peel

    There are several reasons why an epoxy garage floor coating may start peeling soon after application. Avoiding potential missteps can prevent epoxy peeling and keep your garage floor looking brand new.

    The dropdown sections below explain the reasons why your epoxy floor is peeling. 

    Epoxy can peel if the surface has been improperly prepared or not prepared at all. The concrete surface must be thoroughly cleaned and etched prior to applying epoxy — otherwise, the epoxy has a difficult time bonding to the surface. Any oil, grease, or other contaminants left on the surface will prevent the coating from properly bonding. Concrete that has been previously sealed or treated will also resist epoxy adhesion.

    Concrete that is still curing or has high moisture content can cause epoxy peeling. Tape a plastic sheet to the floor and check for condensation after 24 hours to test for excess moisture. If you’ve discovered a moisture problem, we recommend investing in proper ventilation or using a dehumidifier. 

    Very smooth or heavily contaminated concrete may need mechanical abrasion for the epoxy to bond correctly. Without a semi-rough surface, epoxy has a difficult time attaching to the concrete. New concrete requires a minimum 30-day cure time.

    If a previous coating failed on the same surface, the underlying issue must be addressed first. The new epoxy coating will likely peel again if the cause is not addressed. 

    Consumer-grade epoxy kits are more prone to peeling than commercial-grade options. One-part epoxies also have higher failure rates than two-part epoxies. A two-part epoxy combines resin with hardener, which creates a chemical reaction resulting in a strong bond. A one-part epoxy consists only of resin added to a paint. 

    For two-part epoxy products, improper mixing can lead to peeling. It also can cause surface defects. Mix components thoroughly according to label instructions. 

    Hot temperatures or high humidity during application can interfere with proper curing and cause delamination. Ideal conditions are 60°F to 90°F and 30% to 80% humidity.


    Preventing Epoxy Garage Floor Peeling

    With proper application, an epoxy garage floor will last for decades. Follow these best practices when applying epoxy to prevent peeling and delamination:

    Best Practices

    Clean the concrete with a degreaser to remove oil, grease, and other contaminants. Rinse thoroughly. Etch with muriatic acid and rinse completely. Allow to fully dry.

    To check for moisture, tape a plastic sheet to the floor and look for condensation after 24 hours.

    Roughen very smooth concrete using a diamond grinding disk to profile the surface.

    Allow new concrete to cure for a minimum of 30 days before coating.

    Remove existing coatings using chemical strippers or mechanical methods.

    Select quality 100% solids epoxy designed for garage floors. Buy enough for full coverage.

    Carefully follow all label instructions for mixing ratios and times when using two-part epoxy.

    Apply epoxy when ambient temperature is 60°F to 90°F and humidity is below 85%.


    Repairing Peeling Epoxy Floors

    If your epoxy garage floor coating starts to peel, don’t fret. We recommend lightly sanding and wire brushing the peeled sections to remove loose coating. Then vacuum the debris and wipe the floor with acetone solvent, allowing it to fully evaporate. Next, scuff intact coating around the peeled areas with 100-grit sandpaper. Once you’re finished, reapply the epoxy primer and topcoat to stripped areas as directed.

    With proper surface preparation and application, high-quality garage floor epoxy coatings can last many years. Address peeling issues right away and reapply epoxy before moisture infiltrates the underlying concrete.


    So, Is Epoxy Worth It for Garage Floors?

    Epoxy coatings offer a very durable and attractive flooring option for garages when applied correctly. However, the extensive preparation required and higher failure rate compared to other finishes make epoxy less ideal if guidelines aren’t followed precisely. For garage floors with oil stains or extensive cracking, etch-and-seal treatments may be a more suitable DIY-friendly option. From our experience, professional installation is recommended for most epoxy applications to help ensure success.

    Get a Flooring Installation Estimate From Local Experts
    Typical Cost: $6 – $24 per sq foot

    FAQs About Epoxy Garage Floors

    Can you apply new epoxy over the old epoxy?

    Yes, you can apply new epoxy over an existing epoxy floor after properly preparing the surface.


    Does epoxy flooring increase home value? 

    Quality epoxy coatings can add aesthetic appeal to plain concrete floors. This may help increase resale value slightly, but typically not enough to recoup the epoxy flooring cost.


    Can you install epoxy flooring over concrete cracks? 

    Minor cracks and flaws can be covered with epoxy floors. However, cracks over 1/8 inch should be repaired with caulking or patching compounds before applying epoxy.


    How long does epoxy garage flooring last? 

    Expect five to 10 years of life from a quality high-solids epoxy system installed by professionals in optimal conditions. Life span may be shorter in hot, humid climates or if the floor is not properly maintained.


    Editorial Contributors
    avatar for Lauren Greene

    Lauren Greene

    Staff Writer

    Lauren Greene is a passionate storyteller with over 4 years of experience writing and editing. She attributes her expertise from working at local magazines, newspapers, and corporate marketing and communications teams. She has worked on content with topics ranging from plant care, home decor, and home improvement. Lauren resides in Raleigh with her adorable Shih Tzu. You can catch Lauren attending to her plants, spending time with her puppy, enjoying the greenway, or lifting weights at the gym when she’s not writing or researching the latest home improvement topics.

    Learn More

    photo of Lee Ann Merrill

    Lee Ann Merrill

    Chicago-based Lee Ann Merrill has decades of experience writing and editing across a wide range of technical and scientific subjects. Her love of DIY, gardening, and making led her to the realm of creating and honing quality content for homeowners. When she's not working on her craft, you can find her exploring her city by bike and plotting international adventures.

    Learn More