How to Remove Old Paint
Removing old, peeling paint is a vital step when prepping surfaces for a fresh coat of paint. And for painting projects like radiators or doors, a smooth base will benefit the overall finished product. If you want your paint projects to look professionally done, this guide will show you all the ways to remove paint so you can get a smooth finish every time.
Do I need to Strip Old Paint Before Repainting?
While removing paint is the best way to get a smooth finish, you don’t always need to remove paint. As a rule of thumb, you generally don’t need to remove old paint unless it is peeling or bubbling, or if you plan to change paint types. So, if you want to change the color on your walls, you don’t need to remove the paint unless you’re going from an oil-based paint to a latex acrylic paint as these paint types won’t stick to each other.
Tip: If you have to strip old paint, be sure to test for lead. Many removal methods will cause the old paint to release lead into the air if it’s present in the paint. If your paint tests positive for lead, find a professional who can remove the lead paint for simply paint over the paint if possible.
Common Paint Removal Methods
Before discussing methods for specific surfaces, let’s explore the most common paint removal methods that will work on common household surfaces like wood and metal.
Removing Old Paint Using a Paint Stripper
This removal method is messy but quite effective at removing old paint.
- Apply paint stripper in a thick layer on painted surface.
- Allow paint stripper to sit on the painted surface according to the manufacturer’s instructions. It’s important not to leave paint stripper on longer than recommended on the instructions. Doing so will cause the paint stripper to eat the wood fibers, causing lasting damage.
- (Optional) Keeping the paint stripper moist while it works will increase its efficacy. To keep it moist, cover the stripping solution with laminated paper. Tape down to keep in place.
- Remove paint stripper and gently scrape away paint and with the paint stripper. Discard into a bucket.
- Use warm water and a rag to wipe away any excess paint or stripping solution.
Tip: If you’ve gotten paint on your hardwood floors during a project, avoid using a paint stripping solution to get it up. Water-based paint will come up with a little warm, soapy water. Any other paint will come up with a little rubbing alcohol. Both solutions should remove any stubborn paint without damaging your floor’s finish.
How to Remove Paint from a Deck
If you’re planning to stain your deck, removing old paint will ensure you get an even stain. Unlike interior wood that requires a more controlled removal method, you can use a power washer to quickly remove any peeling paint from your deck. You can also use a paint stripper and use a pressure washer to wash away the softened paint. Paint scrapers and nylon-bristle brushes can also help remove paint from the wood grains. Don’t forget to give your desk a quick sanding before applying any stain or paint.
Removing Old Paint with a Heat Gun
This is another common paint removal method that is messy but effective. If using this method, be sure to wear a respirator. Even non-lead paint can release toxic fumes when heated.
- Put down a drop cloth to catch the removed paint for easier clean up.
- Turn on your head gun and allow to warm up according to the manufacturer instructions.
- Pass the heat gun over the paint in a back-and-forth motion, keeping it about two inches away. The paint is ready to be scrapped once it starts to bubble and blister. Stop if the paint begins to smoke.
- Using a putty knife, gently scrape the warmed paint at a 30-degree angle. Continue warming the paint and scraping with the putty knife. Scrape melted paint into a bowl to minimize the mess in your project area.
- You likely won’t be able to remove every bit of paint using the heat gun alone. Any find paint particles left can be removed using extra fine grit sandpaper or steel wool.
Sanding to Remove Old Paint
This method is the most time-consuming way to remove paint and will require a respirator to keep from breathing in paint particles.
- Prep your space by putting down a drop cloth to contain the mess while you’re working.
- To sand away paint evenly, you’ll need various sandpaper grits. You’ll need coarse, medium, medium fine, and fine grit sandpaper for the best results. You can speed up this process if you have a circular sander.
- Start sanding using the coarsest grit and working your way down. It’s important not to overwork the surface with too coarse of a sandpaper grit. Use a finer sandpaper grit for smaller, uneven areas.
How to Remove Paint from Metal
Whether you’re repainting your railing or baseboard heaters, removing paint from metal isn’t always as easy as you think, especially if the paint has been applied correctly. In addition to the three popular methods we just covered, there are a few other methods you can use to remove paint from metal.
Removing Paint with a Scraper
This process is similar to the heat gun process, minus the heat to help loosen the paint. This method works best on flat surfaces with and where the paint is already peeling.
- Using a paint scraper, hold at a 45-degree angle to the metal surface.
- Apply firm, even pressure to remove the paint, taking care not to gouge the metal.
- Repeat this process, working in small sections.
- Once all paint has been removed, use a bit of steel wool to move any smaller paint pieces and smooth out the metal.
Removing Paint with an Angle Grinder with Strip Disk
If you have a larger surface area to remove paint from, this process is similar to the manual scraping method but will be much faster thanks to the angle grinder.
- Put on appropriate safety equipment, including hearing protection.
- Attach a strip disk for paint removal to your angle grinder.
- Hold the grinder at an angle and move steadily across the painting area applying even pressure throughout.
- Work in small sections until all paint has been removed.
Removing Paint with Vinegar and Baking Soda
This process works best on small metal items that can be submerged in the vinegar and baking soda solution such as kitchen hardware, hinges or small railing pieces.
- Mix equal parts distilled vinegar with water in a pot. It’s best to either buy a cheap pot or thrift an old pot since paint will be in this pot.
- Add a ¼ cup of baking soda for every quart of water.
- Bring the mixture to a boil.
- Drop metal items in mixture and leave submerged for 15 minutes. Submerge Metal Items in Mixture
- Remove metal items from solution using tongs. Use a small putty knife to gently scrape off loosened paint.
Remove Paint Using Mineral Spirits
This method words best on metal surfaces because metal is nonporous and won’t absorb the mineral spirits. If you opt for this method, make sure to wear rubber gloves to protect your hands from the harsh chemicals.
- Apply mineral spirits using a clean rag.
- Gently rub the painted surface with the rag to dissolve the paint.
- Wipe away loosened paint with a clean cloth.
- Repeat this process until all paint is removed.
Choosing the Best Paint Removal Method
As we’ve seen, there are several ways to strip paint from a surface but choosing the right method may still feel like a challenge. When it comes to choosing the right method, choose the method that will work with the material you’re painting, works within your budget and will be the easiest for you to complete.
If you’re still struggling to choose the right paint stripping method, your neighborhood Sherwin-Williams associates should be able to help.