How to Remove Paint from Metal – 5 Efficient Methods


by Andrew Ahearne - March 7, 2022

Are you prepping your metal surface for a repaint? Removing paint from metal is doable, but it does take a little elbow grease and know-how to get it right. The good news is that there are several methods to remove paint from metal, whether your object is a small doorknob or a large piece of machinery.

Before we dive headfirst into the good stuff on how to remove paint from metal, let’s talk about the necessary precautions:

 

Safety Precautions before Stripping Paint Off Metal

 

Wear your safety gear: These will include gloves, a mask and goggles. Opt for an N95 mask to avoid breathing in the particles if you plan to remove rust.
 
Work in a well-ventilated area: Paint fumes are toxic and harmful if inhaled. Furthermore, chemical paint strippers are flammable and can cause a fire if not used correctly.
 
Check for lead: Many older paints contain lead, so if you’re working on something pre-1960, it’s a good idea to test for lead paint via a lead testing kit. Paint lead is extremely hazardous can cause a variety of health problems.
 
Now that we’ve got the safety measures out of the way, you’ll first need to prep your surface by removing any loosened paint.

 

Prep your Metal Surface by Removing Loosened Paint

 

For older metal pieces, there may be some paint chipping or peeling off. Before removing your metal’s paint, start by removing any loose paint with a paint scraper or wire brush. Your choice of wire brush will depend on the metal; for brass or copper, use a brass brush and for stainless steel, use a stainless steel brush.

Once loose paint is gone, proceed with any of the following methods for metal paint removal:

 

How to Remove Paint from Metal using a Chemical Paint Stripper

 

If you’re dealing with a large piece of machinery or metal surfaces with a lot of paint buildup, using a chemical stripper is your best bet. Chemical strippers can be purchased at most hardware stores and come in both liquid and gel forms. Removal instructions, however, will vary depending on your chosen product.

Follow these steps for using a liquid chemical stripper to remove paint from metal:

1. Apply a thick layer of chemical stripper to your brush and scrub your painted surface.

2. Wait for the paint to start bubbling or rippling. This means the stripper is working, and the paint is breaking down.

3. Use a paint scraper or wire brush to strip the paint off. If paint remains, simply repeat the process.

 

Remove Paint from Metal with Heat

 

 

High temperatures will cause metal paint to soften, essentially melting it off the surface. For smaller areas, a heat gun is ideal as it offers more precision. You can tackle larger areas with a blow torch, but be careful not to apply too much heat, or you’ll damage the metal.

Before using a heat gun, be sure to wear heat protective gloves.

1. Turn your heat gun on its lowest setting.

2. Apply the gun to the paint and gradually increase the heat. Going too hot initially will warp the metal.

3. Hold your heat gun in place until the paint begins to bubble or melt.

4. Once the paint has melted, use a scraper or wire brush to remove all the paint. For stubborn paint, use sandpaper and finely sand your metal surface.

This metal paint removal method can be strenuous for one person to do it alone. We recommend two people working together – one to hold the heat source and one to scrape off the paint.

 

How to Strip Paint Off Metal Using a Sanding Disc

 

For heavy-duty paint removal, you can use a sanding disc on an angle grinder. This is a more aggressive approach and can damage the metal if not done correctly. However, it’s highly effective in removing paint and requires minimal effort, making it a popular choice for stripping corrosion and paint off metal.

Follow these steps when using a sanding disc on an angle grinder to strip paint from metal:

1. Attach a sanding disc to your angle grinder. An 80-grit disc is ideal for paint removal.

2. Be sure to keep the grinder moving in a consistent motion and do not apply too much pressure, or you’ll damage the metal.

3. Once over half of your paint is removed, switch to a 180-grit sanding disc to finish the job. This finer grit will give a smoother finish while keeping the material intact.

 

How to Remove Paint from Metal without Chemicals

 

Vinegar works as a natural metal paint remover if you’d rather not use chemicals. Baking soda also has abrasive qualities that can remove paint. For this method, we’re going to use vinegar as our choice for removing paint.

1. Heat an old pan and fill it with water and vinegar. Add 60ml of vinegar for every liter of water that’s poured.

2. Bring the vinegar to a boil and add your metal pieces.

3. Leave the metal in the pan and wait for the paint to start bubbling and peeling off.

4. Once the paint has broken down, use a wire brush to remove the existing paint.

 

Manual Sanding to Remove Paint from Metal

 

If you lack equipment and are looking for a budget-friendly option, sandpaper is your best bet. This process is slow and tedious, and requires a lot of elbow grease, but it’s a safe and effective way to remove paint from metal. Hand sanding is a good option for smaller objects that just need touching up.

1. Begin with coarse-grit sandpaper, such as 60-grit.

2. Sand the paint in the same direction as the metal’s grain to help preserve the metal’s surface.

3. Switch to finer-grit sandpaper, such as 180-grit, when half of the paint is removed.

 

What to do After Removing Paint from Metal

 

Now that your paint is off the metal’s surface, it’s important to clean and protect the metal from corrosion. Apply white spirits onto a clean cloth and wipe down the metal – this will remove any grease or remaining paint. Once dry, your surface is ready to be painted or rust-protected.

Removing paint from metal can be time-consuming and tricky, but you can do it with the right tools and techniques. Be sure to use caution when using heat or chemicals to avoid damaging the metal. With a bit of patience, you’ll have a clean and shining metal surface in no time.

 

NewlinePainting – Melbourne Residential Painters

 

If you’re ready to start your painting project but not sure where to start, we’re here to help! Our team of professional Melbourne painters provide a range of painting services for our residential clients. From preparing your surface to choosing the right paint, we’ll take care of everything for you.

Give us a call today at 1300 044 206 to get started or book online for a free quote!



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