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How To Remove Rust from Metal

Learn 3 ways how to remove rust from metal and 2 ways to prevent rust from coming back

How to remove rest from metal rust removerFamily Handyman
Patio furniture, outdoor tools and lawn machines all eventually get rusty. Learn how to remove rust from metal and how to protect the metal so that it doesn't come back.

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Overview

You’re surrounded by tools and machines made out of steel. And when the coatings on those products crack, rust starts to bloom and the battle is on. You can attack rust early and nip it in the bud, or you can wait until you have a full-blown war on your hands. The choice is yours on how to get rid of rusted metal. Either way you’ll need a battle plan on how to get rid of rust and a complete list of weapons at your disposal to start the how to remove rust from metal process. And that’s why we’re going to show you the five ways how to remove rust from metal—three methods to remove it and two steps to prevent it from coming back, along with the best rust remover.

The elbow grease method

Match the abrasive to the shape

Use flap discs, fiber discs and sanders on large, flat areas. Switch to wire wheels for seams, corners and rounded rusted metal areas.

Grinder accessories

A wide range of stripping, grinding and sanding attachments are available for grinders

Detail Sander

Use a detail sander for rusted metal corners, tight spots and small details

Drill accessories

Drill-mounted wire wheels and stripping discs can be used as a rust remover instead of or in addition to grinders, though they don’t have as much power or cover as much surface area.

Power sanders

Finishing and random-orbit sanders are also useful tools for rust removal on flatter surfaces.

Grind, sand or scour off the rust
If you’re not into chemicals and you want to remove the paint along with the rust, use a power tool like a grinder, sander, oscillating tool or drill to remove rust from tools. A grinder fitted with a stripping disc, grinding wheel, fiber or flap disc makes quick work of heavy rust on large objects. But keep the tool moving so you don’t gouge the metal. For smaller jobs, use a traditional sander. To get into small areas, use a “mouse” sander or an oscillating tool with a carbide rasp or sanding pad attachment for this how to remove rust from a metal project.

Whichever tool you choose, always start with the coarsest abrasive to for how to remove rust from metal and pockmarks. Once the rust is gone, switch to a finer grit to smooth out the swirls and grooves caused by the coarse grit. For the smoothest paint job, finish sanding with 400-grit wet/dry paper.

The chemical removal method

Select from the “old standbys”

Brush or spray on any of these acid-based removers. Buy a gel formula for de-rusting vertical surfaces.

Buy enough solution to completely cover the rusted part

Clean off any oil or grease on rusted metal before soaking. Pour the rust remover solution in a plastic tub. Then drop in the rusted item and walk away.

How to remove rust from metal with powerful chemicals…
The old standby rust remover chemicals contain either phosphoric or hydrochloric acid to dissolve the rust. They’re harsh chemicals that give off some pretty intense fumes, so suit up with rubber gloves, goggles and a respirator. Find them in the paint department at any home center. You’ll also need an old paintbrush, a waste tub, a 3-in. putty knife and rags.

Apply the chemicals with the paintbrush and wait the recommended time for the chemicals to work. Then scrape off the liquefied rust. You won’t get it all in a single step—count on multiple applications to completely remove heavy rust buildup. Consider a gel formula when removing rust on vertical surfaces. It’ll cling better and result in less runoff.

…or how to get rid of rust with safer and gentler chemicals
Try one of the newer non-toxic and acid-free soaking solutions shown here. I bought this gallon of Evapo-Rust at an auto parts store. These chemicals dissolve rust through the process of “selective chelation.” I don’t know what that is, but I can tell you it works if you’re patient.

Start by cleaning off any oil or grease. Then dunk the rusted part in a tub of the rust remover solution. The product says it’ll dissolve rust in either 30 minutes or overnight. Based on my experience, you’d better plan on overnight, because even this minimally rusted C-clamp took that long. Keep in mind that this is a soaking solution—you can’t paint it on or spray it on. So, if you’ve got a large object, you’re going to need a lot of solution, and that’s going to cost a lot more.

Acid Magic

I’ve written before about how much I love using Acid Magic for removing rust from sinks, toilets and showers. Well, I obviously have lots of iron in my well water-the latest evidence is that all our ground-level windows had a reddish tint from the sprinklers. I had no idea how to remove it until I thought of Acid Magic again.

I brushed it on with a paintbrush and the rust instantly dissolved and ran down the glass. If you have other mineral deposits in your water, I’m certain it’d take care of them, too.

-Travis Larson, Senior Editor

How to remove rust from metal: The conversion method

Choose between liquid and spray converter

Rust converter comes in brushable liquid or aerosol spray. Rust remover spray provides a smoother finish but doesn’t penetrate severe rust as well as brushable liquid.

Apply converter after wire brushing

Pour a small amount of converter into a cup and work it into the rusty patches with a paintbrush. Then smooth out the brushstrokes and let it dry.

After

When dry, the surface will look rough but rust-free.

Convert it—it’s the easiest method
If you can live with the look of a rough or pockmarked finish, rust converter can save you a lot of time. It kills the rust, prevents its spread and dries into a ready-to-paint primer. Buy it at any home center or auto parts store. Start by removing any flaking paint and rusty dust with a wire brush. Then either spray on the converter or apply it with a disposable paintbrush. Let it dry for the recommended time. Even though the label says you can paint after it dries into a primer coat, I recommend spraying on a real primer. Then paint. Apply a second coat of converter if you’re not going to paint. Don’t return leftover converter to the bottle—it will contaminate the rest. Toss it in the trash, along with the brush.

Three Ways to Remove Rust from Tools

Grind, sand or scour off the rust
Pros: No pockmarks and a smooth finish prior to painting. Complete project in a day. No waiting for chemicals to work.
Cons: Dirty, dusty, hard work. Requires power tools and lots of elbow grease.

Convert the rust
Pros: Easiest way to stop rust and prime in one operation. Less expensive than chemical or mechanical methods for removing rust.
Cons: Leaves a rough or pockmarked finish that’ll show after you paint. May not inhibit rust as long as traditional removal, priming and painting.

Remove rust with chemicals
Pros: Soaking removers can do all the work for you if the item is small enough. Spray removers greatly reduce the grunt work, but they require several applications and some scraping.
Cons: Long wait times for the liquid removers to do their job. Makes a huge mess. Soaking removers are expensive and can be used only on small items. The surface will still be pockmarked after the rust is gone.

Tip: Don’t think you can spray rust-inhibiting paint onto a rusty surface and get good results. The rust will bleed right through the paint and ruin your new paint job. You have to deal with the rust with one of the methods we show here. There’s just no way around it.

Prevent rust: Prime first!

Pick your primer

Choose a regular (nonsandable) primer if the surface is completely smooth. To fill in scratches, choose a sandable primer and lightly sand when dry. Or, use a filler primer to fill in pockmarks.

Prepare and prime

Clean the metal before priming. Then apply the primer over the old paint and the newly sanded metal.

Prime before painting
No matter how you get the rust off, you still have to prime before painting. If the surface is smooth, simply spray on a metal primer (light gray for light-colored paints, black for darker paints). However, if the surface still has pockmarks, swirls or scratches, use a “sandable” or “filler” primer to fill in the depressions.

Surface preparation prior to priming is critical, especially if there’s any old paint left on the item. Clean the surface with a wax-removing solvent (buy at any auto parts store) and a tack cloth.

Prevent rust: Paint & topcoat

Shop for rust-inhibiting paint

Several companies make rust-inhibiting paint. If you don’t find the color you like, try the paint department at an auto parts store. Spray on a final topcoat of clear gloss.

Apply a clear topcoat

Allow the color coat to dry completely. Then spray on a clear topcoat to extend the life of the paint.

Pick a high-quality paint
After all the nasty prep work, why risk another bout of rust by using cheap paint? Inexpensive paint contains less pigment, fewer resin binders and no rust inhibitors. Spend a few extra bucks on a premium rust-inhibiting paint. It will contain zinc additives that provide an extra measure of protection against future rust.

Brushing usually provides a better paint bond than spraying, but it leaves brushstrokes in the finish. However, spraying is tricky and if you stay in one spot too long, you can wind up with paint sag marks in the finish.

Whichever painting method you choose, seal the newly painted item with a clear topcoat. That’ll add to the gloss and dramatically increase the life of the paint by reducing paint oxidation.

Required Tools for this rust remover Project

Have the necessary tools for this how to remove rust from metal DIY project lined up before you start—you’ll save time and frustration.

  • Angle grinder
  • Bucket
  • Cordless drill
  • Dust mask
  • Hearing protection
  • Orbital sander
  • Paint scraper
  • Paint tray
  • Paintbrush
  • Rags
  • Safety glasses
  • Sanding block
  • Wire brush
You’ll also need grinder accessories for stripping, sanding and wire brushing, a detail sander, stripping discs and wire wheels for a drill, leather gloves and rubber gloves.

Required Materials for this rust remover Project

Avoid last-minute shopping trips by having all your materials ready ahead of time. Here’s a list.

  • Chemical rust removers
  • Metal paint
  • Metal primer
  • Rust converter
  • Sandpaper