TL;DR: Secondary containment coating turns a porous concrete berm or steel dike into an impervious barrier capable of holding a tank release under EPA SPCC and Florida DEP rules. The right chemistry, dry film thickness, and surface prep depend on what’s stored, Florida’s heat and humidity, and how the structure is inspected and tested.
A secondary containment structure is only as good as what coats it. The concrete berm or steel dike does the structural work, but the coating is what makes it impervious — the actual barrier between a tank failure and soil, groundwater, or a storm drain.
For facilities across Orlando, Clermont, St. Cloud, Ocala, DeLand, and Deltona, that distinction matters because Florida adds its own layer of requirements on top of federal rules, and the state’s heat, humidity, and heavy rain seasons are hard on coatings that weren’t specified for the climate.
What Is Secondary Containment Coating?
Secondary containment coating is a chemical-resistant lining system applied to concrete or steel containment structures — dikes, berms, curbing, tank pads, and spill decks — that surround aboveground storage tanks, drum storage areas, and chemical processing equipment.
Its job is simple to state and hard to execute: hold a full tank release long enough for it to be detected and cleaned up, without letting the liquid migrate through the slab or joints.
EPA does not dictate a specific coating chemistry, but sets a performance standard requiring that containment be sufficiently impervious to contain leaks, spills, and accumulated precipitation until the collected material is detected and removed.
Bare concrete does not meet that standard on its own. Concrete is porous, develops shrinkage cracks, and will absorb and eventually pass many stored chemicals and fuels without a proper lining system.
The Regulatory Framework: Federal and Florida Rules
EPA’s SPCC Rule (40 CFR Part 112)
The SPCC rule applies to non-transportation-related onshore facilities with more than 1,320 gallons of aboveground oil storage capacity in containers of 55 gallons or more, or more than 42,000 gallons of buried oil storage capacity, that could reasonably be expected to discharge oil into U.S. waterways.
Under the rule,
EPA 112.8(c)(2) requires secondary containment sized for the entire volume of the largest single tank, plus sufficient freeboard for precipitation.
Most specifiers work from a simple benchmark:
containment must hold 110% of the volume of the largest container within the area and must be impervious to the materials being stored.
Hazardous waste storage containment falls under a related but separate rule.
That rule sets the same core requirement — containment sufficiently impervious to contain leaks, spills, and accumulated precipitation until the collected material is detected and removed, per 40 CFR 264.175.
Florida’s Additional Layer: Chapter 62-762 and 62-761
Florida does not simply defer to the federal rule.
Florida stacks two rulebooks: federal SPCC under 40 CFR Part 112, and the state’s own rule, where the Florida Department of Environmental Protection regulates aboveground petroleum and regulated substance storage tank systems larger than 550 gallons under Chapter 62-762 of the Florida Administrative Code, and underground tanks larger than 110 gallons under Chapter 62-761.
The state rule is explicit about coating performance, not just containment geometry.
The state rule spells out that regulated storage tanks must have secondary containment, and that the containment material has to be impervious to what you store, non-corrosive or corrosion protected, and able to hold up to outside conditions.
The rule’s reach extends past petroleum.
Mineral acid tanks such as sulfuric, hydrochloric, and phosphoric acid over 110 gallons are covered by the rule as well.
That’s relevant for Central Florida water treatment plants, agricultural operations, and industrial facilities that store acids alongside fuel.
Florida’s statutory definitions also tie the coating performance standard directly to the inspection process.
Secondary containment means a release detection and prevention system that meets specific performance standards, and includes dispenser liners, piping sumps, double-walled tanks and piping systems, or single-walled tanks or piping systems that are contained within a liner or an impervious containment area.
Why Concrete Alone Doesn’t Contain Anything
A containment berm built to the correct dimensions on paper will not perform as designed if the lining fails during an actual release. All coatings selected for a containment dike need to properly adhere to the substrate, hold the full capacity of the largest tank within the containment boundary, and resist the specific chemical being stored so it can’t migrate into the surrounding soil.
Adhesion and chemical resistance aren’t assumptions — they’re tested. Chemical resistance is commonly assessed in accordance with ISO 2812-1, which specifies methods for determining how a coating resists liquids other than water, often run for roughly a year to observe blistering, cracking, or delamination before a coating earns a rating.
Coating Materials Used for Secondary Containment
There’s no single “right” coating for every containment structure. The choice depends on what’s stored, the substrate condition, and whether the structure sees foot or vehicle traffic.
Epoxy Systems
Epoxy and related resin coatings are
resin-based coatings with high impact resistance, offering chemical resistance for containment structures encountering minimal movement, with little or no cracking or surface damage
, and are typically used on
new steel tanks and new, fully cured concrete tanks or containment structures.
They’re a common default for petroleum and fuel containment where the slab is sound and stable.
Polyurethane and Polyurea Linings
Where a structure has existing cracking, settlement, or is likely to move,
polyurethanes and polyureas are resin-based coatings with moderate impact resistance, highly flexible coatings used when substrates are subject to cracking or movement or when repairing damage, typically applied to existing steel tanks or concrete structures with structural damage.
Spray-applied polyurea in particular
has become one of the major candidates for secondary containment use, applied extensively to provide the monolithic impervious membrane needed to contain spilled and fugitive chemicals caused by leakage or accident.
Flexible Epoxies and Crack/Joint Treatments
Internally flexible epoxies serve a narrower but critical role:
highly flexible elastomeric materials that remain flexible over time, used as sealant, crack bridging, and heavy-duty membrane materials for joint and crack repairs and joint sealants in containment areas.
Expansion joints and cold joints are where most containment failures start, so this detail work matters as much as the field coating.
Specialty Linings for Green or Damp Concrete
Florida’s humidity creates a specific problem: new concrete pours often can’t fully cure before a coating deadline arrives. Urethane concrete sealants are formulated to seal over green concrete, allowing curing and moisture discharge while providing a stable base for the liquid coating system applied above it — a detail that matters on fast-tracked municipal and industrial projects where cure time is tight.
Specification Basics: Thickness and Coverage
Containment coatings are specified far thicker than ordinary industrial paint. Dry film thickness for a reinforced concrete berm typically runs well into the tens of mils, with total system builds varying based on the chemical exposure and substrate condition. Getting this measurement right in the field — not just on the data sheet — is covered in our guide to dry film thickness measurement on industrial coatings.
Coverage rate depends heavily on the coating’s solids content and the build required, which is why containment specs call out DFT ranges rather than a single gallon-per-square-foot number.
Surface Preparation: The Step That Determines Whether the Coating Works
Concrete surface prep for containment coating follows
the SSPC/NACE International joint standard SSPC-SP13/NACE No. 6, which covers the preparation of concrete surfaces before the application of protective coating or lining systems and is used by specifiers, applicators, and inspectors responsible for defining a standard degree of cleanliness, strength, profile, and dryness of prepared concrete surfaces.
The standard establishes minimum criteria to ensure the prepared surface meets the necessary cleanliness, strength, profile, and dryness for effective adhesion and performance of protective systems.
Skipping or shortcutting this step is the single most common reason containment linings fail early — not the coating chemistry itself.
On steel containment components, dikes, and tank pads, we run the same abrasive blasting containment protocols used on every commercial surface prep job, detailed in our guide to abrasive blasting containment systems.
Testing: Holiday Detection and Adhesion
A secondary containment lining is a monolithic membrane, which means any pinhole, skip, or thin spot is a potential leak path. Holiday testing with low or high-voltage spark testers locates these defects before the structure goes back into service, and it’s a standard line item on any compliance-driven containment spec. We cover the process in detail in what holiday testing is and why it matters for industrial coatings.
Adhesion is typically verified with pull-off testing, and chemical resistance is backed by lab data from the coating manufacturer specific to the stored commodity — fuel, hydraulic fluid, mineral acid, or process chemical.
Pros and Cons by Material Type
- Epoxy: Excellent chemical resistance and hardness on stable, cured substrates; brittle on structures with active cracking or movement.
- Polyurea/polyurethane: Fast cure, highly flexible, bridges minor cracks; typically a higher material cost and requires plural-component spray equipment and a trained crew.
- Urethane concrete/green concrete sealers: Lets a containment project move forward on a tight schedule without waiting out a full concrete cure; it’s a prep layer, not a final chemical barrier on its own.
When Secondary Containment Coating Matters Most in Central Florida
Several facility types across our Orlando-area service territory run into this spec regularly:
- Municipal and utility sites with fuel storage for generators, fleet vehicles, or water treatment chemicals in Ocala, DeLand, and St. Cloud.
- Pipeline and utility operators maintaining tank farms and dike fields across Central Florida.
- Airport facilities with fuel storage and hydrant pit containment systems.
- Theme park and entertainment venue back-of-house operations storing hydraulic fluids, chemicals, and fuel for maintenance fleets.
- Agricultural and heavy equipment operations in the Clermont and Ocala areas with bulk fuel or chemical storage above the state’s 550-gallon aboveground threshold.
Many of these same facilities also maintain water tanks and elevated structures that fall under a related but distinct coating spec — see our breakdown of potable water tank coating standards for that comparison.
Why Florida’s Climate Changes the Spec
Humidity drives two practical problems on containment jobs here: concrete that never fully dries between rain events, and coatings applied over marginal moisture conditions that blister or delaminate within a few years instead of lasting a full service life. Documenting substrate moisture before application starts is part of the compliance record and a requirement for hitting the coating’s specified service life — not an optional field note.
Heat adds a second variable: pot life and cure windows for two-component epoxies and polyureas shrink in Central Florida’s summer temperatures, which is why crew experience with local conditions matters as much as the product data sheet.
Getting a Containment Coating Project Right
A compliant secondary containment coating project has three non-negotiables: surface prep to SSPC-SP13/NACE No. 6, a chemistry matched to the stored commodity with documented chemical resistance, and verification testing (DFT and holiday detection) before the structure goes back into service. Skipping any of the three creates a containment system that looks compliant on paper but won’t perform in an actual release.
Southern Sandblasting & Painting LLC specifies and installs containment coating systems for municipalities, utility operators, and industrial facilities throughout Orlando, Clermont, St. Cloud, Ocala, DeLand, and Deltona, working to the same surface prep and testing standards used on DOT and municipal bridge structures across Central Florida.
Recommended Reads
- What Is Holiday Testing and Why It Matters for Industrial Protective Coatings
- How Dry Film Thickness Measurement Ensures Coating Performance on Industrial Steel
- How Abrasive Blasting Containment Systems Work on Commercial Job Sites
