Short answer
Start by scraping off whatever is loose. For drips and small areas, apply a paint stripper made for masonry (a gel or paste stays put on a vertical or sloped surface), let it work for the time on the label, scrub with a stiff brush and rinse. For a whole painted surface, mechanical removal is faster: a rented floor grinder or diamond cup wheel for garage floors and slabs, a pressure washer for exterior latex, or soda blasting where you want to keep the surface texture. Paint that has soaked into the pores leaves a shadow after any method; grinding takes it out, and an overlay hides it.
Pick the method for the job
- Drips and splatters. Scraper, then a gel paint stripper, stiff brush, rinse. Twenty minutes.
- A painted patio or walkway. Stripper across the whole area in sections, then pressure wash. Allow a day and expect a second pass on stubborn spots.
- A painted or epoxied garage floor. Grinding. Strippers struggle with epoxy and the floor needs a profile for whatever goes on next anyway.
- Decorative or stamped concrete. Soda blasting or a gentle stripper: both leave the texture alone where grinding would flatten it.
- Graffiti on a wall. A graffiti remover followed by low-pressure washing, in that order.
Step by step with a stripper
- Scrape or wire-brush off any loose paint and sweep.
- Protect plants and nearby surfaces; wear gloves, eye protection and a respirator if the label calls for one.
- Apply the stripper thickly and keep it wet for the dwell time on the label. Covering it with plastic sheeting stops it drying out.
- Scrub with a stiff nylon brush; the paint should lift as a sludge. Scrape it up and bag it.
- Rinse well. Pressure washing helps on exterior slabs.
- Neutralize if the product requires it, let the slab dry, and judge whether a second pass or grinding is needed.
When the shadow won't go
Paint that soaked in while it was wet leaves a tint in the pores after the film is gone. Grinding removes the tinted surface; a concrete overlay covers it with a new one; a stain or coating can turn the whole surface one color on purpose. If the slab underneath is in good shape, any of the three is reasonable. If it isn't, read fix or replace first.
Frequently asked questions
Does a pressure washer remove paint from concrete?
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Exterior latex that is already peeling, often. Fresh or well-bonded paint, and oil-based or epoxy coatings, no. It works best after a stripper has loosened the paint.
Does vinegar remove paint from concrete?
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Only barely, on fresh latex. It's not an effective stripper for anything that has cured. Use a masonry paint stripper.
What's the fastest way to remove paint from a garage floor?
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A floor grinder with a diamond cup wheel. It removes paint and the top of the surface in one pass and leaves the floor ready for a new coating. Rent one with dust extraction, or hire it done.
Will paint stripper damage the concrete?
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Masonry strippers won't. Avoid muriatic acid: it removes paint by etching the surface and leaves a rougher, lighter patch.
Can you paint over the old paint instead?
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Only if the old coat is sound and you prepare it properly. Most failed concrete coatings fail because they were put over something that was already letting go. Removing the old layer is usually the honest fix.
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