ace Preparation
Surface preparation is the single biggest factor in whether a coating lasts. Resin coatings need a clean, sound, porous surface with the right texture — called a concrete surface profile (CSP) — to grip.
Common prep mistakes include:
- Acid etching instead of mechanical prep. Acid etching can leave residue and an inconsistent profile. Professional installers typically use diamond grinding or shot blasting.
- Coating over existing sealers or coatings without removing or properly abrading them.
- Leaving contaminants behind such as oil, grease, curing compounds, paint, or adhesive residue.
- Skipping repairs to spalled, weak, or dusty concrete.
Think of it like painting a wall: if you paint over dust and grease, it won’t stick. The same is true for floors — only the stakes and costs are much higher.
2. Moisture Vapor in the Slab
Concrete may look dry, but moisture vapor constantly moves up through many slabs, especially those poured without a vapor barrier or those in older buildings. When a non-breathable coating is applied over a slab with high moisture vapor emission, pressure can build beneath it. The result can be bubbling, blistering, and eventual delamination.
How Professionals Handle Moisture
- Moisture testing before installation using methods such as in-slab relative humidity probes or calcium chloride tests
- Moisture mitigation primers designed to reduce vapor transmission when readings are high
- Choosing a more moisture-tolerant system — for example, urethane cement in wet environments
San Antonio and Austin’s humid seasons and heavy rains can make moisture problems worse, particularly in slab-on-grade buildings.
3. Ignoring Joints and Cracks
Concrete slabs have control joints and expansion joints for a reason — the slab moves. Coating straight over these joints without planning almost guarantees cracking along those lines.
A proper installation includes:
- Honoring moving joints by recutting them after coating and filling with a flexible sealant
- Filling static joints and cracks with semi-rigid fillers suited to the traffic, especially in warehouses with forklift traffic
- Repairing structural cracks before coating
Joint work is a big part of warehouse and industrial projects. You can see the results in projects like our Giglio Distributing warehouse and ElringKlinger San Antonio.
4. Wrong System for the Environment
Not every coating is right for every space. Failures happen when:
- A thin, low-cost roll-on coating is used in a high-traffic industrial area
- A standard epoxy is installed where hot-water washdowns and thermal shock occur
- An interior-only epoxy is used in direct sunlight, leading to yellowing and fading from UV exposure
- A non-conductive coating is installed where static control is required for electronics
Matching the system to the space is essential. That’s why we offer multiple options through our commercial and residential services — from high-build epoxy and decorative flake to quartz, urethane systems, and polished concrete. For specialized needs, consider projects like our static-control epoxy at Navistar Manufacturing San Antonio.
5. Temperature and Humidity During Installation
Resin coatings are sensitive to conditions during application. Installing in extreme Texas heat, cold, or high humidity can affect curing and adhesion. Coatings applied when the slab temperature is too close to the dew point can develop cloudiness, blush, or poor bonding between coats.
Experienced installers monitor air temperature, slab temperature, and humidity — and adjust timing or materials as needed.
6. Hot Tire Pickup in Garages
In residential and commercial garages, hot tires can soften and lift thin or poorly bonded coatings. This is often seen with DIY kits. A properly prepared, high-quality system with an appropriate topcoat is much more resistant. If you’re weighing a garage upgrade, read is epoxy flooring worth it for your San Antonio garage.
7. Rushing the Return to Service
Coatings may feel dry to the touch long before they are fully cured. Putting heavy equipment, vehicles, or rolling carts on a floor too early can cause marks, indentations, or adhesion damage. Always follow the recommended cure times for foot traffic, light traffic, and full service.
8. Improper Maintenance
Even a well-installed floor needs the right care. Harsh cleaners, abrasive pads, and neglected grit can dull or wear the surface over time. For polished floors, see how to maintain polished concrete floors for long-term performance.
Signs Your Existing Floor Coating Is Failing
- Peeling or flaking edges
- Bubbles or blisters in the surface
- Cracks that follow slab joints
- White haze or cloudy patches
- Worn-through traffic lanes
- Hollow sound when tapped
If you notice these signs, a professional assessment can determine whether spot repairs are possible or whether the floor needs to be removed and replaced.
Choose a Contractor Who Starts With the Slab
A long-lasting floor begins with what you can’t see after installation — testing, grinding, joint work, and choosing the right system. Modern Day Concrete brings that approach to every project, from schools like Hays ISD to industrial facilities and retail spaces. Explore more in our projects gallery, read our FAQs, or browse more articles on our blog.
Contact Modern Day Concrete to schedule a floor assessment and get a coating system built to last.