One homeowner put the question plainly in a home-improvement forum this spring: an 800 sq ft patio, painted for the tenth time, bubbling and peeling again, and a $2,000 quote for the product alone (community discussion). Replies suggested switching to a stain that soaks in rather than a paint that sits on top. Here’s what each route costs.
Why paint peels on outdoor concrete
A floor paint maker’s own preparation steps point to the two usual causes:
- Moisture. Tape a 1 ft square of plastic to the concrete and leave it for 24 hours. If moisture shows on the concrete side, the slab isn’t dry enough to paint.
- Grip. Sprinkle water on the surface. If it soaks in, you’re ready. If it beads, the concrete needs more cleaning and etching. The maker says smooth, troweled concrete must be acid etched, and that properly prepared concrete should feel like medium-grit sandpaper.
A slab that fails either test will keep pushing paint off, however many coats go on.
What each removal route costs
| Route | Published price | For an 800 sq ft patio | Notes |
|---|---|---|---|
| Chemical stripper (Rust-Oleum Paint Stripper) | Covers up to 75 sq ft per gallon | About 11 gallons | 30 minutes to 5 hours to lift; rinse three times |
| Soy gel stripper (Direct Colors) | About 200 sq ft per gallon | About 4 gallons | Apply at 60°F to 95°F surface temperature |
| Rent a small grinder (El Paso Tool Rental, 10-in) | $72.56 per 4 hours; $100 per day | $100 a day, plus abrasives | Rates exclude tax and optional charges |
| Rent a grinder and dust collector (Rocket Supply, Denver) | Grinder for under 800 sq ft from $225 a day; dust collectors from $85 a day | About $310 a day | Store says every grinder rental needs a dust collector |
| Pro removal (Cascade Concrete Coatings, Seattle area) | $3 to $5 per sq ft | $2,400 to $4,000 | Grinders and scarifiers; multiple days |
| Pro removal (Duration Concrete Coatings, Fort Wayne) | $3 to $8 per sq ft | $2,400 to $6,400 | Plus disposal by the ton |
The three pro-removal prices are garage-floor installers’ coating-removal rates, applied to an 800 sq ft patio by our arithmetic; a patio quote may differ. Patio totals are our arithmetic. Prices from each seller’s own page, checked October 2026. How we research: methodology.
Stripper gallons are the coverage math only; price them at your store before choosing that route. Coverage varies with texture and porosity, so a rough or textured porch will take more.
The pressure washer question. A washer alone usually lifts only the loose paint. The floor paint maker above says to remove loose or flaking paint by wire brushing or scraping, and to keep a pressure washer at 1,750 psi or lower to avoid damaging the concrete. If you’re hiring a washer to “strip” bonded paint, ask what method they’ll use. For other things that won’t wash out, see why a driveway can still look dirty after washing.
Older homes. If your home was built before 1978, the EPA recommends hiring a lead-safe certified contractor for work that disturbs paint.
Cover it instead: what that costs
Not every route starts with bare concrete. One Denver garage-floor installer says paint and DIY kits are often removed at no charge when it applies a new coating, which starts around $5.45 a square foot. Existing epoxy or polyaspartic costs about $1 a square foot more to remove. That’s priced for garages, but it shows how installers fold removal into a new system: about $4,360 for 800 sq ft at the starting rate.
If you’d rather not paint again, the forum replies’ suggestion, a penetrating stain, needs bare, clean concrete too. Get the old paint off first, then follow the stain maker’s own prep and moisture steps.
A decision in three questions
- Does the slab pass the plastic-sheet and water-drop tests? If not, new paint will likely peel again.
- How much is still bonded? A little flaking scrapes off. A whole patio of bonded paint means a stripper, a grinder or a pro.
- Will you keep a coating on it? If yes, get a removal-and-coating quote as one job. If no, plan for bare or stained concrete.
Avoid quick fixes that leave marks. Our guides to muriatic acid blotches and paint or epoxy drips on a driveway cover what can go wrong.
Sources
Based on 11 sources · How we price
- Community discussion, r/HomeImprovement, a patio repainted ten times keeps peeling (Mar 2026): reddit.com/r/HomeImprovement/comments/1s8umsj
- Other community discussions, r/pressurewashing and r/homeowners (paraphrased; not linked)
- Sika (DRYLOK), Floor Paint Latex product data sheet (PDF): usa.sika.com/dam/dms/us01/v/drylok-floor-paintlatex.pdf
- Rust-Oleum, Paint Stripper technical data (PDF): images.homedepot-static.com/catalog/pdfImages/65/65707bd2-b24e-44ba-861a-eef740bb1d81.pdf
- Direct Colors, Soy Gel Stripper How-To Guide (PDF): directcolors.com/diy/wp-content/uploads/2022/04/Soy-Gel-Stripper-How-To-Guide.pdf
- El Paso Tool Rental, 10in Concrete Grinder: eptoolrental.com/toolDetail.php?id=39189
- Rocket Supply, Concrete Grinder & Equipment Rentals (Denver): rocketsupply.net/rental
- Cascade Concrete Coatings, cost to replace a failed garage floor (Seattle area): cascadeconcretecoatings.com/blog/how-much-does-it-really-cost-to-replace-a-failed-garage-floor-hidden-costs-revealed
- Duration Concrete Coatings, garage floor coating cost (Fort Wayne): durationconcretecoatings.com/blog/how-to-calculate-garage-floor-coating-cost-expert-guide-2025-prices
- Solid Custom Floor Coating, Garage Floor Coating Pricing (Denver): solidgaragefloorcoatings.com/garage-floor-coating-pricing
- U.S. EPA, Lead Renovation, Repair and Painting Program: epa.gov/lead/lead-renovation-repair-and-painting-program
