Learn how to match coating chemistry to walls, steel and floors in a plant. Covers surface prep, moisture testing, chemical resistance charts, regulated areas and what to include in an estimate request.
Protective coatings work best when the chemistry fits the main stress on each surface. Epoxy handles chemicals and abrasion on stable concrete. Polyurethane or urethane cement covers thermal shock, impact or a moving substrate. Surface prep to the right Concrete Surface Profile (CSP), plus a moisture test, decides whether that coating lasts.
Which protective coatings fit each surface in my plant?
Epoxy is the default for chemical and abrasion resistance on stable concrete floors. Polyurethane handles impact and substrate movement, such as mezzanines or vibrating equipment. Urethane cement covers thermal shock and the harshest chemicals. Polyaspartic or an aliphatic topcoat goes where UV light would yellow a standard epoxy.
The table below maps four chemistries to the exposures they handle best. Use it to shortlist two or three options for each surface before you request an estimate.
| Coating Chemistry | Best For | Key Strength |
|---|---|---|
| Epoxy | Stable concrete floors, chemical exposure | Hardness, chemical resistance, jointless finish |
| Polyurethane | Mezzanines, vibrating equipment, impact zones | Flexibility, impact resistance, movement capability |
| Urethane Cement | Thermal shock, harsh chemicals, live food areas | Extreme temperature resistance, non-taint, durability |
| Polyaspartic | UV-exposed areas, rapid cure needs | UV stability, glossy finish, fast curing |
Sherwin-Williams notes that epoxy forms a jointless, high-performance surface that withstands heavy traffic and mechanical wear. It is also easy to clean, which helps where hygiene matters. Polyurethane is more flexible than epoxy, so it suits areas where the substrate may move.
Urethane cement combines the toughness of cement with the durability of polyurethane. It resists impacts, chemicals and extreme temperatures. Polyaspartic cures fast and resists UV light, so it holds up where sunlight reaches the floor.
How do I match a floor coating to the chemicals it will see?
Pull the chemical-resistance chart for each candidate system. Find your chemical by name and concentration, then note the temperature and how long the spill sits. Read the rating codes: TS means total saturation, OK means acceptable, and SD means slight degradation. Treat anything worse than that as a disqualifier for that area.
Resistance depends on the resin, the concentration and temperature of the chemical, and the length of exposure, according to Sherwin-Williams. The right topcoat adds tailored resistance to acids, alkalis or solvents.
Here is a worked example. Your plant uses acetic acid at 10% concentration. Open the chart and find the row for acetic acid at 10%. In the Sherwin-Williams chart, most listed systems rate OK or SD at that concentration. Rate each candidate against that row. Then check the 30% and 50% rows, because a spill can be stronger than your normal mix. Any system that shows NR (not recommended) at the strength you may see is out for that zone.
What surface prep standard applies to concrete before coating?
Abrasive-blast the slab to a profile of CSP 1–3. Clean it, and make sure it has at least 3,500 psi compressive strength. Fill bug holes, voids and fins, and grind protrusions smooth before the first coat. These are the requirements in the Sherwin-Williams application instructions for one epoxy system. Always check the data sheet for the system you choose.
CSP is a reference from the International Concrete Repair Institute (ICRI 310.2R-2013). Compare the finished floor to an ICRI chip set, and consider casting the profile to keep a record, per Sherwin-Williams.
The contractor needs a substrate that is clean, durable, flat and free of contaminants. Inspect the slab for soundness, contaminants and moisture first. Remove weak concrete down to sound material and patch it with repair mortar. ASTM D 4258 covers cleaning grease, dirt and loose material, and methods include vacuum, air blast, water, detergent and steam cleaning, per the Sherwin-Williams prep guide.
Why does prep decide how long the coating lasts?
Resin coatings grip the concrete through the surface profile. If laitance (a weak surface layer), grease or moisture sits under the film, the bond fails and the coating lifts off the slab. Wear resistance also depends on a sound, clean substrate, not only on the topcoat.
A review of concrete protection products found that most organic surface coatings improved the abrasion resistance of concrete, especially epoxy. Even so, the coating can only protect what it is bonded to.
Skipping prep to save money often leads to early failure. The coating may look good at first, then peel or chip under traffic. Budgeting for blasting and repair lets the coating last as long as its chemistry allows. For a look at running this work in a live building, see our post on phasing a floor coating with minimal downtime.
Do I need a moisture test before coating the floor?
Yes. Test with ASTM F1869 (moisture vapor emission rate, or MVER) or ASTM F2170 (in-situ relative humidity). If readings run high, plan on a moisture mitigation primer before the main coating.
One example is a cementitious urethane system. Its data sheet says it tolerates MVER up to 25 lbs of moisture per 1,000 square feet per 24 hours under ASTM F1869. Under ASTM F2170 it tolerates 100% internal relative humidity, per the manufacturer's data sheet. It is applied as a primer and basecoat broadcast with silica sand.
If your results exceed the limit of the system you pick, add a moisture barrier layer to the spec. Without one, vapor can push the coating off the slab.
How should structural and equipment steel be prepared and coated?
Remove rust, oil and old paint by abrasive blasting or power washing. Then apply a direct-to-metal (DTM), corrosion-resistant or high-temperature system chosen for the building's environment. Prep prevents early failure. The chemistry is matched to the exposure, whether UV, chemicals or heat.
Good prep gives the coating maximum adhesion. Corrosion-resistant coatings protect structures and equipment from rust, chemicals and moisture. High-temperature coatings suit surfaces where heat is a factor. Project time depends on size, surface condition and coating type. Our page on industrial painting and coatings describes how we approach steel and equipment.
What data-sheet properties should I compare for a floor coating?
Compare chemical resistance for the specific chemicals present, abrasion, impact, slip resistance and thermal tolerance. Urethane and cementitious urethane lead on abrasion, impact and thermal shock. Epoxy leads on chemical resistance for many acids and solvents.
Urethane coatings resist abrasion, impact and thermal shock. That suits areas with hot water washdowns or rapid temperature changes. Cementitious urethane adds exceptional thermal shock and chemical resistance. Epoxy offers excellent chemical resistance across industrial settings.
Line up two or three candidates side by side. A system strong in one area may fall short in another. A chemical-resistant epoxy, for example, may handle thermal shock worse than urethane cement. Choose the chemistry that matches your dominant stress.
What wall coating requirements apply in food, pharma or regulated areas?
Regulated areas call for washable coatings and, where required, antimicrobial ones that meet USDA or FDA rules. Confirm the coating meets the agency requirement for your product line before you specify it. Standard commercial paint may not meet hygiene or durability needs.
Polyurethane cement systems are often used in live food plants because they are non-taint, according to Sherwin-Williams. Urethane-based systems also suit hot water washdowns.
Rules vary by product type, so a coating approved for one use may not be approved for another. Verify compliance before the product goes into your project plan.
What drives the cost of an industrial coating project?
Surface area, prep scope, coating chemistry, number of coats and downtime limits drive cost. Prep scope includes blasting, repair and moisture mitigation. A urethane cement or MMA system generally costs more than standard epoxy. It can lower lifecycle cost where thermal shock or fast turnaround governs.
MMA systems cure rapidly and can often go in within a single day, per Sherwin-Williams. That cuts downtime. Slower-curing systems may need more downtime or phased work.
If the slab needs heavy repair or moisture mitigation, the price rises. Ask for a breakdown of prep, primer, basecoat and topcoat costs.
How does lifecycle cost compare to the upfront price?
A coating that fails early because of poor prep or a mismatched chemistry costs more over time than a higher-priced system that lasts. Weigh each system's expected service life under your exposure against the full cost of prep, application and re-coating.
A cheap system that needs replacing every few years repeats the prep, labor and materials each time. Downtime for re-coating adds to that. Ask each bidder for expected service life under your conditions, then compare total cost of ownership rather than the first price.
What should I include in the estimate request?
List each surface (floor, wall, steel) with its exposure: chemicals by name and concentration, temperature range, UV and traffic type. Add the prep standard (CSP, moisture test) and any regulatory needs. An itemized estimate can then break out prep, primer, basecoat and topcoat separately, so you can compare bids like for like.
This keeps every bidder working from the same scope. It also stops low bids built on assumptions. If you are unsure which prep or tests apply, ask the contractor to recommend them. For an itemized estimate covering prep, coating and labor at your facility, request an estimate from PaintPro Tennessee.