Decades of advertising hyperbole have made us understandably hesitant to believe any “too good to be true” claim.
So when we saw that there was a product on the market that claimed to dissolve rust without any aggressive brushing or harsh chemicals, we were a bit skeptical.
But that’s exactly what Evapo-Rust says it’ll do—which means it could be a potential game changer when it comes to our metalwork, surface prep, and part restoration. Better still, EvapoRust says it is safe to the touch, doesn’t release any harmful vapors, and can even be re-used a few times.
Fortunately, our Honda CB350 motorcycle project gave us an excellent chance to put EvapoRust to the test. While we were rebuilding the bike’s forks, we noticed its external coil springs were covered in some mild surface rust and could use a bit of clean up.
How to Use Evapo-Rust to Remove Rust & Corrosion
While we could’ve probably worked over the spring’s surface with a wire wheel and some Scotch-Brite pads, we hoped that Evapo-Rust would save us the hassle. So here’s how it went:
In order to work its magic, a part needs to be bathed in Evapo-Rust for a few hours, depending on how bad the rust is. So we took a large snack container, flipped it on its side, and filled the bottom with the rust remover. Then we plopped the spring in, where it was partially submerged in the rust eating liquid. A few hours later we checked back and rotated the spring slightly to cover more surface area.
This process went on over the course of a weekend, where we gradually rotated the spring so each side would sit fully in the Evapo-Rust rust remover for a few hours at a time. We inspected its progress with each turn too, as we excitedly watched the EvapoRust gradually eat away at the spring’s surface rust.
It’s worth pointing out here that Evapo-Rust won’t perform miracles. If the part is significantly corroded, don’t expect it to magically return to like-new condition. Evapo-Rust simply removes the surface rust and does not restore the underlying metal. The light surface corrosion on our coil springs here made them the perfect candidates for this test.
After about two days, we fully removed the spring and the difference was dramatic—the spring was virtually free of surface rust, with only very minor pitting remaining. We rinsed the spring off in our utility sink to remove any leftover Evapo-Rust residue (again, it’s non-corrosive and perfectly safe to handle the part), and poured the remaining Evapo-Rust from the big snack container back into its original jug, ready to be used again.
Again, the spring only began with minor surface rust, but the results were still impressive. There was little to no evidence that rust was ever there.
But even after the spring was done, we knew that rust would likely return, so as an extra precaution to prevent the spring from rusting again, we hit it with Summit Racing’s spray rust preventer paint.
Does Evapo-Rust Work on Nuts & Bolts Too?
The Honda CB350 coil spring was a pretty large part, but Evapo-Rust works great for small hardware too—we found that out when we repaired an old snow thrower.
Evapo-Rust Comes in Several Sizes
For the price and hassle it saves, we keep a small supply of Evapo-Rust on-hand now, so it’s ready whenever we come across any mild surface rust.