Short answer: if the door is steel, that bubbling paint is almost always rust starting underneath the surface. If the door is wood or wood-composite, it's swelling from absorbed moisture. Both are caused by the same humid, rainy climate, but they're different problems with different fixes — which is probably why you and your spouse are arguing about it.
What's Actually Happening Under the Paint
Steel garage doors have a thin factory coating over bare metal. Once that coating gets a scratch, a chip, or a worn spot — from a bike pedal, a stray rock, years of sun — moisture gets underneath it. Orlando's humidity keeps that moisture sitting there instead of drying out quickly, so the metal starts to oxidize from the inside out. What you see on the surface (a bubble, a soft spot, a rust-colored ring) is usually smaller than what's happening underneath.
Wood and composite doors don't rust, but the wood fibers absorb water vapor out of the air, especially during the humid stretch from late spring through hurricane season. The wood expands, which is why a bottom panel can start binding against the track or a door that used to close flush suddenly drags. When the air dries out again, the wood shrinks back — but not always evenly, which is how warping and cracked paint lines start.
How to Tell Which One You've Got
- Rust: reddish-brown discoloration, flaking or bubbling paint, a rough or pitted texture when you run a hand over it, usually starting at the bottom corners, around hinges, or near weep holes where water collects.
- Swelling: a panel that looks slightly thicker or warped, paint that's cracked along a seam rather than bubbled, a door that binds, scrapes, or needs extra force to close — most common on wood doors or wood trim pieces on an otherwise steel door.
If you're not sure, press on the spot. Rust often feels brittle or crumbly at the edges. Swelling feels soft or spongy but intact.
Why This Shows Up So Much in This Climate
A few things stack together here. The humidity keeps moisture in contact with metal and wood longer than it would in a drier climate, so small amounts of water do more damage over time. Afternoon downpours during hurricane season mean water regularly splashes or pools at the bottom of the door, which is exactly where rust and swelling usually start first. And the wind-load hardware many Orlando-area doors use — stronger tracks, reinforced panels, extra fasteners — gives moisture more metal surfaces and more seams to work into. If your home is anywhere near the coast, salt in the air speeds up corrosion on top of all that.
What Happens If You Ignore It
Surface rust left alone eventually eats through the panel skin, which weakens the door's structure right where it needs strength most — the bottom section that takes the brunt of wind and water. Swollen wood that keeps cycling through wet-and-dry seasons will eventually warp permanently or delaminate at the seams. Either way, the hardware suffers too: hinges, rollers, and tracks exposed to the same moisture can rust and seize, making the door louder, harder to open, and more likely to bind off track.
What You Can Actually Do About It
- Touch up any paint chip or scratch on a steel door as soon as you see it, using a rust-inhibiting primer before repainting — this is the single most effective thing you can do.
- Keep weep holes at the bottom of the door clear so water doesn't sit against the panel.
- Wipe down and lightly lubricate hinges, rollers, and tracks every few months with a silicone-based lubricant, not oil, which attracts dust and grit.
- Check the bottom weather seal for cracks or gaps — a failed seal lets in the splashback from afternoon storms directly.
- Make sure gutters and downspouts direct water away from the garage slab instead of letting it pool at the door.
- For wood doors, reseal or repaint exposed edges, especially the bottom panel, before the heavy rain months hit.
When to Call Orlando Garage Door Repair
If rust has already eaten through a panel, or a wood section has warped enough that the door won't sit flush, patching it won't hold for long — that's a job for our Garage Door Panel Replacement service, where we swap just the damaged section instead of the whole door. If the door is binding, dragging, or coming off track because of swelling, we handle that as part of Off Track Door Repair. And if you just want to catch this stuff early, our Garage Door Maintenance & Tune-Up covers hardware, seals, and hinges before small moisture damage turns into a bigger repair.
If you're seeing rust, swelling, or a door that's starting to fight you, call Orlando Garage Door Repair. We serve Orlando, Kissimmee, Winter Park, Dr. Phillips, Windermere, Altamonte Springs, Ocoee, and Lake Buena Vista, and we can usually get someone out the same day.