TL;DR: Hangar floors usually need a thick resin system, often a high-build epoxy with an aliphatic urethane topcoat, that stands up to phosphate ester hydraulic fluid, fuel, and tire loads. The floor must also keep the drainage NFPA 409 requires. Steel hangar doors need abrasive blasting and a primer, intermediate coat, and UV-resistant topcoat. In Central Florida, the job only works if you test the slab for moisture and plan around the weather.
Aircraft hangar floor and door coatings are protective systems built for two different jobs. Floors need a thick, chemical-resistant resin system, usually a high-build epoxy with a urethane topcoat, that holds up to Skydrol, jet fuel, and tire loads. Doors need a blasted steel surface and a primer-and-topcoat system that stops rust.
In Orlando and the rest of Central Florida, heat and humidity make both jobs harder. This guide covers how each system works, what the fire code expects from a hangar floor, and how to plan the work around aircraft.
What makes a hangar floor harder to coat than a warehouse floor?
Two things make it harder: aviation fluids and fire-code drainage. A typical warehouse floor never has to deal with either one.
Many aircraft hydraulic systems run on phosphate ester fluid, sold under names like Skydrol. Eastman, the company that makes Skydrol, publishes a material compatibility guide for Skydrol fluids. It rates materials from excellent resistance down to no resistance, meaning the material breaks down in the fluid. Ordinary epoxy floor coatings aren’t made for this. Drips from landing gear and service carts can soften and stain them. A hangar spec should list the fluids used in the building and require the coating maker to confirm resistance in writing.
Drainage is the second issue. NFPA 409, the Standard on Aircraft Hangars, calls for floor trench drains to limit the spread of spilled fuel and reduce fire and explosion risk. The 2004 edition set a minimum floor pitch of 0.5 percent. The coating crew has to keep that slope and keep drain grates and trench edges clear. Patch material should never go into a drain. If you’ve written specs for distribution centers, our guide on writing a warehouse floor coating specification covers the basics. Hangars add fluid and drainage rules on top of that.
Which hangar floor coating systems hold up best?
Most working hangars use a high-build epoxy base with a chemical-resistant aliphatic urethane topcoat. Urethane concrete fits areas with heavy impact or damp slabs. Thin epoxy paint is usually the wrong choice. The table below compares the main options.
| System | Typical build | Strengths | Watch-outs |
|---|---|---|---|
| Thin-film epoxy (rolled coats) | A few mils | Low upfront labor, easy touch-up | Can soften under phosphate ester fluids and wears fast on tow routes |
| High-build epoxy + aliphatic urethane topcoat | About 45 to 60 mils for some manufacturer systems | Good balance of impact and fluid resistance, with a bright finish. The urethane topcoat resists UV near open doors. | Needs a dry, well-prepared slab |
| Urethane concrete (urethane cement) | About 1/4 inch | Very tough under impact. Some products are rated for higher slab moisture. | Thicker, slower install and more material per square foot |
| Epoxy base + polyaspartic topcoat | Thin topcoat over epoxy | Fast cure, so the hangar goes back into service sooner | Fluid resistance varies a lot by product, so verify it against your hydraulic fluid |
Build thickness and resistance claims vary by product. Ask for the data sheet and the fluid-resistance test results for the exact system being bid.
Why does slab moisture matter so much in Central Florida?
Moisture moving up through the slab is a leading cause of floor coating failure, and Central Florida slabs see plenty of it. Coatings maker Tnemec explains that rising vapor carries alkaline salts and chlorides that attack the coating where it bonds to the concrete. You see it first as bubbles and blisters, and then the coating peels off.
The air doesn’t help. NOAA data for Orlando International Airport puts average relative humidity at about 74 percent for the year and above 79 percent in August. Hangar doors often stay open for hours, so conditions inside tend to follow the weather outside.
A good spec requires moisture testing before any coating goes down:
- ASTM F2170 sets probes in drilled holes to read relative humidity inside the slab.
- ASTM F1869 uses calcium chloride to measure how much vapor comes off the surface. Many coatings call for 3 to 5 pounds per 1,000 square feet per 24 hours or less.
If the readings come back high, the fix is a moisture-tolerant primer or a different system. After testing, the crew shot blasts or grinds the concrete to open the surface. Then they repair cracks and joints. Slab joints need a filler that can move with the slab.
How are steel hangar doors blasted and coated?
Steel hangar doors are abrasive blasted down to clean metal. Then they get a primer, an intermediate coat, and a UV-resistant topcoat. Blasting removes rust, mill scale, and failed paint, and it cuts an anchor profile so the primer can grip.
Door corrosion usually starts in the same spots: bottom rails where blowing rain collects, panel lap seams, fastener heads, and the steel around wheels and guides. On the sunny side, the topcoat chalks and fades first.
Doors have moving parts, which a tank or a bridge doesn’t. Rollers, cables, seals, and drive parts need to be masked or removed. Some door makers also say which surfaces must stay uncoated. Large bi-fold and sliding doors are often coated in sections so the hangar can still open. After application, crews check film build with dry film thickness measurement and find pinholes and thin spots with holiday testing. A missed spot at a seam is usually where rust starts.
How do you plan aircraft hangar floor and door coatings around flight operations?
Plan the work by bay and by cure time. Most owners can’t empty a hangar for weeks, so the work is done in phases.
- Blast and coat doors first so abrasive and overspray don’t land on a fresh floor.
- Move aircraft out of one bay at a time and coat that section.
- Keep the bay closed until the coating reaches the maker’s cure time for wheel and jack loads.
- Keep fire detectors, foam nozzles, and trench drains clear the whole time.
Weather matters too. In Orlando’s NOAA record, April is the least humid month at about 67 percent, and late summer is the most humid. Hangars at regional airports around Ocala and DeLand follow the same pattern. That often makes spring the easier time for door work and floor curing.
Signs it’s time to recoat
- Soft, sticky, or stained spots where hydraulic fluid dripped
- Blisters or peeling near slab joints or older floor sections
- Worn paths down to bare concrete along tow routes
- Rust bleeding at door bottom rails, seams, and fasteners
- A chalky, faded topcoat on the sun-facing side of the doors
- Old coating or patch material lapping over trench drain edges
What drives the cost
The price depends on floor area, slab condition, moisture readings and any fix they call for, the coating system and its thickness, door size and type, how much masking the moving parts need, and how many phases the schedule needs. Testing and repairs found during prep can change the scope, so a site visit comes before a firm number.
Why work with Southern Sandblasting & Painting LLC on hangar coatings?
Southern Sandblasting & Painting LLC is a commercial and industrial coatings contractor based in Orlando. The team has 20+ years of experience serving Central Florida. Services include abrasive blasting, commercial and industrial painting, and concrete sealing. Airport facility and hangar maintenance is one of the project types the company handles. Clients include airports, municipalities, general contractors, and commercial facility owners. Work follows industry safety and coatings specifications, with Florida heat, humidity, and corrosion in mind.
Get a Free Estimate. Call Now: (407) 409-1158, or request a free estimate online for your hangar floor or door project.
Frequently Asked Questions
How long before aircraft can go back on a newly coated hangar floor?
It depends on the product and the temperature. The coating’s data sheet sets separate times for foot traffic, wheel loads, and chemical exposure. Plan the return to service by the maker’s full-cure time, not by how dry the floor looks.
Can a new coating go over an existing hangar floor coating?
Sometimes. The old coating has to be well bonded and compatible with the new system, which is checked with adhesion tests. If it’s peeling, blistered, or softened by fluids, it has to come off first.
Should hangar floor and door work be done in the same project?
Often, yes, as long as the doors are blasted and coated before the floor. That order keeps abrasive dust and overspray off the new floor coating.
Do hangar floor coatings need slip resistance?
Most hangar specs add some slip resistance, often by broadcasting aggregate into the coating, because fluids and water end up on the floor. More texture means more grip but makes the floor harder to clean, so match it to how each area is used.
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 to Write a Warehouse Floor Coating Specification That Holds Up to Heavy Use
