When you're out exploring in your RV, it’s easy to focus on the fun stuff—mountain views, beachside sunsets, and cozy campfires. But there’s something hiding underneath your rig that needs a little love too: rust.
Rust can sneak into places you don’t often look, like under the RV or under the hood. And once it starts, it can spread and cause damage. Don’t worry, though! With some simple steps, you can stop rust before it becomes a big problem.
Let’s learn how to protect your RV from rust in those hidden spots.
What Is Rust, Anyway?
Rust happens when metal touches water and air for a long time. It turns brown or orange, and it can eat away at metal parts. That’s not good for your RV!
Places that are most likely to rust include:
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Under the frame of your RV
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Around wheel wells
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Under the hood of your tow vehicle or motorhome
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Inside storage compartments that get wet
Why Rust Matters
Rust isn’t just ugly—it can be dangerous. If it grows too much, it can weaken metal parts that hold your RV together. Over time, this could affect:
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Your suspension system
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Brakes and fuel lines
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Engine parts and battery connections
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The frame and steps
That’s why it’s important to check for rust and stop it early.
1. Wash Under Your RV
After driving in the rain, snow, or on salty roads, give your RV a rinse—especially underneath. Use a hose with a spray nozzle to wash away mud, dirt, and salt.
Tip: Car washes with undercarriage sprayers work great if you can fit your RV or tow vehicle in them.
2. Check After Each Trip
Every few trips, get a flashlight and look under your RV. Check these spots:
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Frame and axles
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Steps and supports
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Bottom of the storage bays
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Any metal parts near the wheels
Look for orange or brown spots, flaking paint, or any bubbling in the metal.
3. Dry Out Damp Areas
If you find water in your storage bays or near the battery, dry it up. Use a towel or small fan. Don’t let water sit—it leads to rust.
Also, check under mats or rugs in storage spaces. These can hide wet spots and moisture.
4. Keep the Hood Area Clean
Under the hood of your motorhome or tow vehicle can get dirty, too. Use a rag to wipe away mud, leaves, or moisture. Look at the battery, engine parts, and wires for signs of rust or corrosion (white or green powder near metal connections).
Battery Tip: Keep the terminals clean and dry. Use a battery brush to clean off any build-up.
5. Use Rust Protection Spray
You can spray a rust-preventing product on metal parts under the rig. These sprays coat the metal and block water from getting in.
Where to spray:
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Frame and undercarriage
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Metal steps and brackets
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Hinges on doors or compartments
Just be careful not to spray on brakes or parts that get hot.
6. Fix Small Rust Spots Early
If you see a small rust patch:
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Scrub it with a wire brush or sandpaper.
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Wipe it clean.
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Spray with rust-stopping paint or sealant.
Stopping rust early saves you from big problems later.
7. Store Your RV the Smart Way
When you're not using your RV, store it somewhere dry. If possible:
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Park on concrete or gravel (not grass or dirt)
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Use wheel covers
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Avoid parking under trees that drip water or sap
Even just raising your RV tires on boards can help keep moisture away.
8. Keep Gutters and Seals Clean
Water that leaks in from above can run down and collect under your rig. Clean your gutters, check your roof seals, and keep your windows tight. Less water = less chance for rust to start.
9. Watch the Weather
Camping near the ocean? Salt in the air can cause rust. Driving in snowy places? Road salt can coat your RV's underbody. Just remember to rinse your RV when you're done in these spots.
Final Thoughts
Rust might be sneaky, but you’re smarter. By checking under your RV and under the hood, washing off salt and dirt, and spraying protective products, you can keep your RV strong for years to come.
A little care now means fewer big repairs later—and more time for adventures.
So next time you’re parked in a beautiful spot, take a moment to peek underneath. Your RV will thank you!