How to Use WD-40 to Remove Rust

WD-40 has numerous uses, one of which is rust removal.

Rust is the product of a chemical reaction between iron and oxygen. When an oxygen molecule comes into contact with an iron molecule, it forms iron oxide, or rust, and it's more than just an eyesore. If left untreated, rust can ultimately ruin whatever object it affects. As the corrosion process continues, more metal is exposed to rust, which eventually weakens the metal to the point where it either crumbles or is no longer useful. Whenever you discover rust on a valuable possession, it's important to remove it as quickly as possible. WD-40 can help with this endeavor.

Things You'll Need

• Wire brush
• 120 to 160-grit sandpaper (for moderate rust)
• 80-grit or lower sandpaper (for severe rust)
• Steel wool

Instructions

1. Spray the rusted surface with WD-40, enough to thoroughly soak the area. After you've sprayed the area, allow it sit for up to 10 minutes before you proceed. WD-40 works to break down the bonds between metal and rust, though it requires a little time to give the best results.

2. Use a wire brush on the surface you soaked with WD-40. With the rust loosened, the brush should clean away most of the corrosion. Brush the surface until you're satisfied you removed most of the rust.

3. Spray another application of WD-40 on the surface and let it sit once again for five to 10 minutes.

4. Use sandpaper to remove any remaining rust. You may use 120- to 160-grit sandpaper for moderate rust and 80-grit or lower for heavy, severe rust. While sanding, be sure to remove all of the rust you possibly can. If you leave any, the rust will reappear at some point down the line.

5. Reapply WD-40 as needed for stubborn areas of rust, allowing it to soak before you continue sanding or brushing.

6. Rub the area with steel wool to buff the metal and remove the smallest remnants of rust. After you've removed all of the rust, coat the surface with an application of WD-40. This will provide a protective barrier against future corrosion.

Tips & Warnings

• If you plan on painting the surface you've cleaned with WD-40, make sure to wash it thoroughly before applying the paint or primer.

• Do not use WD-40 on parts you wish to lubricate, for example, bearings or bicycle chains. WD-40 is a solvent that will prevent the lubricant from taking hold and thus result in unnecessary wear and tear.

References

• Metal Web News: A Primer on Rust
• WD-40: WD-40 FAQs
• The Natural Handyman: All About WD-40
• Thrifty Fun: Removing Rust from Tools