PROJECT SUMMARY
Concrete Resurfacing project summary
Resurfacer to buy20 bags
- Area
- 400 sq ft
- Thickness
- 1/4"
- Condition
- Fair
- Bonding primer
- Included
- Difficulty
- Intermediate
- Build time
- ½–1 day
- Estimated materials
- $418–$566
Concrete Resurfacing Calculator
Resurfacer bags, primer, crack filler and cost to refinish a worn slab.
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Concrete Resurfacing calculator
Coat thickness
Advanced optionsfine-tune the details…
Estimates are planning aids, not a professional quote. Double-check quantities and product coverage — and any local code or permit requirements — before you buy.
⚠ Resurfacer is a thin cosmetic and structural-patch layer, not a new slab — it won't fix a slab that's cracked through, heaving, or settling unevenly. Address the underlying cause first or the repair fails again.
Cost breakdown
Material only · national-average rates
| Concrete & Footings | $323–$437 |
| Finishing & Sealant | $95–$129 |
| Total | $418–$566 |
Excludes tools, delivery, tax and permit fees. Labor not included — this is a DIY materials estimate.
Shopping list
Every item · grouped by store sectionThese are affiliate links: we may earn a commission if you buy through them, at no extra cost to you. It never changes what the calculator recommends — the shopping list comes from your dimensions, not from what pays.
Concrete & Footings
- 20× 40 lb bagsCementitious concrete resurfacer — 400 sq ft at 1/4" · incl. 5% waste
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Finishing & Sealant
- 2× galConcrete etching / surface cleaner — opens the surface so the resurfacer bonds instead of flaking off
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- 2× galAcrylic bonding primer — 1 coat brushed or rolled just ahead of the resurfacer
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Tools
✓ required · ○ helpful
- Pressure washer (rental) — strip contamination before etching
- Concrete etching brush or stiff push broom
- Gauge rake / notched squeegee — spreads resurfacer to a consistent depth
- Magnesium finishing trowel
- Mixing paddle + 1/2" drill
- 5-gallon buckets
Project notes
- This assumes a resurfacing job over an existing slab that's structurally sound but cosmetically worn — flaking, scaling, minor pitting, hairline cracking. It is not a substitute for demolition and repour on a slab that's cracked through, heaved, or settling; a resurfacer bonded to a moving substrate fails the same way the substrate does.
- Bag coverage scales directly with the thickness you choose: doubling from 1/8" to 1/4" roughly doubles the bag count for the same area, since you're spreading the same product over the same footprint at twice the depth. Pick the thinnest coat that hides the wear — going thicker than needed just spends more on material with no extra durability.
- Surface prep decides whether this lasts. Pressure wash and etch (or acid-etch) every job regardless of condition so the resurfacer has a clean, open pore structure to key into; skipping that step is the single most common reason a resurfacing job peels within the first year.
- This is a planning estimate. Actual bag counts vary with how heavily pitted the surface is (deep pitting eats extra material to fill level before the finish coat goes on) and local product coverage specs, which differ by brand — check the bag for the manufacturer's stated coverage at your chosen thickness before you buy.
About this calculator
How to estimate a concrete resurfacing
Enter the size of the worn slab and pick a coat thickness and the Concrete Resurfacing Calculator works out how many bags of cementitious resurfacer to buy, plus the bonding primer and surface cleaner every job needs to key in properly. It's built for a driveway, patio, walkway or garage floor that's structurally fine but cosmetically tired — scaling, flaking, hairline cracks, faded color — not a slab that needs to be torn out.
Add linear feet of cracking or existing control joints and it prices the filler and sealant to prep them before the resurfacer goes down, and an optional acrylic topcoat if you want extra UV and stain protection once it cures. Every quantity here is a planning estimate — check your chosen product's coverage chart before you buy, since brands vary.
Step by step
How to resurface a concrete slab
A step-by-step walkthrough to go with your plan above. Follow the product instructions and any local code or permit requirements as you work.
- 1
Measure and choose a thickness
Measure the slab and use the calculator to pick a coat thickness — 1/8" for light wear, up to 1/2" for heavier spalling — and get your bag count and prep materials.
- 2
Clean and etch the surface
Pressure wash off dirt, oil and any loose or flaking material, then acid-etch or mechanically profile the slab so it's clean and open-pored. The resurfacer only bonds to a properly opened surface.
- 3
Rout and fill cracks and joints
Rout out any cracks and fill them with a flexible polyurethane sealant, and reseal existing control or expansion joints, before you place any resurfacer over them.
- 4
Apply the bonding primer
Brush or roll on the acrylic bonding primer just ahead of the resurfacer while the primer is still tacky, working in sections you can resurface before it dries.
- 5
Mix and place the resurfacer
Mix to the manufacturer's ratio with a paddle mixer, then pour and spread it with a gauge rake to a consistent depth, working quickly since these mixes set fast.
- 6
Trowel and texture the finish
Smooth the surface with a magnesium trowel, then broom or texture it to match the surrounding concrete's slip resistance before it sets up.
- 7
Cure before traffic
Keep the slab out of rain and direct sun while it sets, allow foot traffic after a few hours, and wait for full cure — usually 5 to 7 days — before driving on it or sealing it.
- 8
Seal if you added a topcoat
Once fully cured, apply the acrylic cure-and-seal in two thin coats for extra UV and stain resistance, letting each coat dry before the next.
Equip the job
Recommended gear for this build
Hand-picked categories that match the shopping list above. Links open a current selection so you can compare brands and prices.
These are affiliate links: we may earn a commission if you buy through them, at no extra cost to you. It never changes what the calculator recommends — the shopping list comes from your dimensions, not from what pays.
Concrete & FootingsCementitious concrete resurfacer (40 lb bag)Polymer-modified resurfacing mix that trowels or squeegees over worn concrete to restore a smooth, uniform surface.
$18–22/bag
Finishing & SealantAcrylic concrete bonding primerKeys the new resurfacer into the old slab so it doesn't delaminate — skip this and the repair fails early.
$28–36/gal
Concrete & FootingsPolyurethane concrete crack sealantFlexible filler for routed cracks, applied before resurfacing so the repair doesn't telegraph back through.
$8–11/tube
ToolsGauge rake / notched squeegeeSpreads the resurfacer to a consistent, repeatable depth across the slab in one pass.
$25–45
ToolsPressure washer (rental)Strips grease, sealer and loose material so the etch and primer can actually bond.
$40–65/day
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Answers
Frequently asked questions
How much concrete resurfacer do I need?
Coverage depends entirely on the thickness you apply: a 40 lb bag covers roughly 45 sq ft at 1/8" but only about half that at 1/4", because you're spreading the same volume of material over a deeper layer. Multiply your slab's square footage by the coat thickness in feet to get cubic feet needed, then divide by the bag's mixed yield. This calculator does that math for you and adds a small waste allowance for spillage and touch-up.
Can resurfacer fix a cracked or heaving slab?
No — resurfacer is a thin cosmetic and light structural-patch layer that bonds to the existing surface, not a repair for a slab that's cracked all the way through, heaving, or settling unevenly. It will bridge hairline shrinkage cracks and hide pitting and scaling, but a slab with real structural movement needs the underlying cause fixed (or the section replaced) or the crack will telegraph straight back through the new coat within a season or two.
Do I need to prime before resurfacing?
Yes, on almost every job. A bonding primer keys the resurfacer into the old concrete's surface, and skipping it is one of the most common reasons a resurfacing job peels or delaminates within the first year. Pressure wash and acid-etch or mechanically profile the slab first so it's clean and open-pored, then brush or roll on the primer just ahead of placing the resurfacer while it's still tacky.
How long does resurfacer need to cure before I can walk or drive on it?
Most cementitious resurfacers are firm enough for foot traffic in 1 to 4 hours and can typically take light vehicle traffic after about 24 hours, but full cure for sealing or heavy use is usually 5 to 7 days — always check your specific product's data sheet. Keep it out of direct sun and away from rain during the initial set, and don't seal it until it's fully cured or you'll trap moisture underneath.
What's the difference between resurfacing and an epoxy coating?
Resurfacing is a cement-based product mixed with water and trowelled or squeegeed on to restore a worn concrete surface's texture and appearance — it's gray (or tinted) and matches the look of new concrete. An epoxy or polyaspartic coating is a two-part resin system applied over sound, properly prepped concrete for a glossy, chemical-resistant finish, typically on garage floors. Use resurfacer to fix a beat-up driveway or patio; use an epoxy system when you want a decorative, high-gloss floor coating.