River Falls, WI · East Twin Cities Metro Mon–Fri 8a–5p · Sat by appt Owner-operated · Veteran-friendly (715) 307-8302

Surface Prep & Repair · Star Prairie, WI · Est. 2003

Surface Prep & Repair in Star Prairie, Wisconsin.

Star Prairie is a St. Croix County village of about 700 on the Apple River, five miles north of New Richmond on Highway 65. It sits on the line between the Town of Star Prairie and the Town of Stanton, and a stream called Saratoga Spring joins the river in the middle of the village. About 50 minutes north of River Falls. We install polyurea + polyaspartic floor coatings for Star Prairie homeowners: diamond-ground prep, custom flake colors, 1–2 day install, written 15-year warranty. A small older village core, a mid-century through 1990s layer around it, newer houses on the edges, and farm country in every direction where the shop or the pole barn holds more concrete than the house does.

Text Dave · (715) 307-8302 See Pricing

Surface Prep & Repair in Star Prairie

What an install looks like in Star Prairie.

Star Prairie is small and its concrete is straightforward, with two local wrinkles worth knowing. The first is water. The springs here run cold and never stop, which is why the trout farm on the Apple River has raised fish on this spot for a century and a half, and it also means the ground near the river holds moisture all year. A basement or a walkout on that low ground gets a moisture test before a coating goes on it. The second is grit. Most of the roads through the Town of Star Prairie and the Town of Stanton are gravel, so what lands on a garage floor here is sand and crushed rock rather than the road salt that chews on a slab in town. Sand scours bare concrete and dulls floor paint; a polyurea coating takes it without cutting through. Outside the village the building with the largest floor is usually a pole barn or a machine shed.

Surface Prep & Repair specifically in Star Prairie

Star Prairie prep is old floor paint on the village stock, freeze-thaw scaling and door-line spalling, and a moisture answer on anything near the river. We diamond grind to bare concrete, fill cracks with polyurea and rebuild spalled edges.

Neighborhoods we work in

  • Village center on the Apple River
  • Highway 65 corridor
  • Town of Star Prairie
  • Town of Stanton
100% Diamond grind On every coating install
0 Acid etch Ever, on any job
20+ Years experience Surface prep since 2003
Always Included Not an upsell line item

Why we don't install epoxy in Star Prairie

Why diamond grinding is the only acceptable surface prep, and acid etching is not.

Surface prep is where cheap coating installs get cheap. Acid etching takes 30 minutes with a $40 jug of muriatic acid; diamond grinding takes hours with $30,000 worth of equipment. The cost difference is why some installers acid etch, and the bond difference is why those floors peel. Here's the head-to-head:

Acid Etching What cheap installers do
  • Doesn't open the slab uniformly. Acid reacts with the calcium in concrete unevenly: areas with more cement react more, areas with more aggregate react less. The surface profile after acid is inconsistent.
  • Leaves chemical residue. Muriatic acid leaves chloride ions in the concrete pores. Coatings bonded over chloride residue have a weak chemical bond that fails sooner.
  • Produces a chemical bond, not mechanical. The coating is essentially "glued" to the surface. Mechanical bonds (where the coating fuses into open pores) are dramatically stronger.
  • Doesn't remove existing coatings. Old paint, sealers, or coatings have to come off some other way. Acid won't dissolve them. Many installers acid-etch over partial old coatings: guaranteed failure.
  • Health + environmental concerns. Strong acid in residential garages and basements is unpleasant. The runoff has to go somewhere. Local code is increasingly restrictive on residential acid use.
Diamond Grinding What we use
  • Uniform surface profile. Diamond-tooled grinders cut the same depth across the entire slab regardless of cement-to-aggregate ratio. The surface profile after grinding meets ICRI CSP-3 to CSP-4 standards for coating bond.
  • Removes contamination + weak top layer. Grinding cuts through the laitance (the weak, dust-prone top layer of cured concrete) and any surface contamination (oil, paint, sealers, coatings) in one pass. Clean substrate for the bond.
  • Mechanical bond. The coating fuses into the open concrete pores, locking in. Mechanical bonds resist 4-10× the pull-off force of chemical bonds in published lab tests.
  • Removes any existing coating. Old paint, epoxy, or sealer comes off cleanly. We grind down to bare concrete on every job.
  • HEPA-vacuum dust collection. Industrial grinders with attached HEPA vacuums make zero dust mess in residential interiors. Garage, basement, mudroom: we can grind without making the rest of the house unlivable.

If a coating contractor offers to "save you money on prep" by acid-etching, that's the moment to walk away. The prep is the foundation of the install; saving 30 minutes on prep guarantees a re-install in 18 months. Diamond grinding is the only surface prep we do, and it's included in every coating price.

Star Prairie Pricing

Surface Prep & Repair cost in Star Prairie, WI: $7–9 per sq ft.

For a coating install, prep is included in the per-sq-ft coating price: never a separate line item, never an upsell. For standalone prep work (sub-contracting to another coating contractor or repair-only jobs), pricing depends on slab condition + scope.

With Coating Install

Included

any coating job

From $0 to extra
  • Diamond grinding
  • Crack & joint repair
  • Spalling patch as needed
  • Built into coating price
Get my number
Sub-Contract Prep

Standalone

any sq ft

From $2 to $4 / sq ft
  • Diamond grinding only or full prep
  • Coordinate with coating contractor
  • Documented surface profile
  • Larger jobs price lower per sq ft
Get my number
Repair-Only

Bid by scope

linear ft + sq ft

From Quote to by Dave
  • Crack filling (per linear foot)
  • Spall + pit repair (per sq ft)
  • No coating
  • Stopgap before future install
Get my number

Standalone prep is typically a contractor-to-contractor arrangement, but homeowners with damaged slabs sometimes commission repair-only work as a stopgap before a future coating install. Send photos + scope and Dave will quote.

The 6-step install

How we install your floor in Star Prairie.

Same checklist on every floor. The reason our coatings still look new at year ten when the cheap stuff peeled in year two.

  1. 01

    Assess slab condition

    On-site visit to evaluate slab condition: existing coatings, cracks, spalling, oil contamination, moisture indicators. Determines scope of prep work needed and which grind tooling to use (concrete hardness varies, tooling matches).
  2. 02

    Diamond grinding (full slab)

    Industrial diamond-tooled grinders, HEPA-vacuum dust collection, ICRI CSP-3 to CSP-4 surface profile. Wall-to-wall, edge-to-edge, including corners and tight spots. Removes existing coatings, contamination, and the weak laitance layer.
  3. 03

    Crack & joint repair

    Visible cracks filled with flexible polyurea joint filler that moves with the slab. Control joints either filled flush (smooth surface) or maintained as visible (homeowner preference). Edge cracks at the slab perimeter sealed.
  4. 04

    Spalling + pitting repair

    Spalled surface areas patched with polymer-modified concrete repair compound, troweled flat to match surrounding surface. Pits filled and smoothed. Compound cures overnight, ready for coating the next day.
  5. 05

    Surface clean + final inspection

    Full vacuum sweep + tack-cloth wipe to remove residual dust before coating goes down. Walk-through with homeowner to confirm prep is complete and sign off before basecoat.
  6. 06

    Documented + warrantied

    For standalone prep work, we document surface profile (CSP rating) and crack repair scope so the coating contractor has a record. For our own coating installs, the prep is integrated into the 15-year coating warranty: bond failure due to inadequate prep is on us, not you.

Star Prairie questions

Common questions for Star Prairie homeowners.

Is Star Prairie too small a town to get a floor coated?
No. Star Prairie is five miles north of New Richmond on Highway 65, about 50 minutes from River Falls. A one-car garage or a small utility room is an ordinary job.
Our place is right on the Apple River. Does the water matter?
For a garage on grade, rarely. For a basement or a walkout down by the river, yes. The springs here run all year, so that ground stays wet in a way the prairie above it does not. We run a calcium chloride moisture test on those floors, and a high reading means a vapor-mitigation primer goes under the polyurea.
We are on a gravel road. Will the sand wear a coating out?
No. Sand and crushed rock scour bare concrete and dull floor paint, but a polyurea coating is a solid membrane and takes that kind of grit without cutting through. It also means you can sweep or hose the floor instead of grinding grit into the slab every time you drive in.
Why does my floor coating keep peeling?
Almost always inadequate surface prep. The most common cause is acid etching instead of diamond grinding; the chemical bond is dramatically weaker and fails first under thermal cycling, moisture, or load. Other causes: coating applied over old coating without grinding it off, moisture transmission from below (untested), or hot-tire pickup damage on epoxy. If a previous floor coating peeled within a few years, the next one needs to be installed differently: start with full diamond grinding to remove whatever's left, then a polyurea (not epoxy) system on top.
What's the difference between diamond grinding and acid etching?
Diamond grinding mechanically cuts the concrete surface with diamond-tooled abrasives, opening the pores uniformly and creating a mechanical bond profile (ICRI CSP-3 to CSP-4). Acid etching uses muriatic acid to chemically react with the surface: uneven, leaves chloride residue in the pores, creates a weaker chemical bond. Lab pull-off tests show diamond-ground surfaces hold coatings at 4-10× the bond strength of acid-etched surfaces. We never acid etch.
Is surface prep included in the coating price?
Yes. Diamond grinding, crack repair, and spalling patch are included in every coating install we do. It's not a separate line item or upsell. The 15-year warranty exists because the prep underneath it is right; charging extra for prep would be charging extra for the foundation of the install.
Do you do standalone surface prep without a coating?
Yes, for two cases: (1) sub-contracting to another coating contractor whose own crew doesn't have grinder equipment, and (2) repair-only work for homeowners with cracks or spalling that need fixing but who aren't ready for a full coating yet. Standalone prep runs $2-4 per square foot depending on slab condition and scope; repair-only is bid by scope.
How long does the diamond grinding take?
For a typical 2-car garage (~440 sq ft), grinding runs 2-3 hours including setup, wall-to-wall coverage, and cleanup. Larger spaces scale linearly. Crack repair adds 30-60 minutes depending on linear footage. Spalling repair adds 1-2 hours per 100 sq ft of repair area. The dust is contained by HEPA vacuum so the rest of your house stays livable during grinding.
Will the dust from grinding be a problem?
No. Our grinders run with attached HEPA-vacuum dust collection. Effectively zero airborne dust escapes during grinding. We can grind in residential garages, basements, and mudrooms without affecting other parts of the house. After grinding we vacuum the slab a final time before any coating goes down.
What if my slab has cracks, can it still be coated?
Almost always yes. Cracks get filled with flexible polyurea joint filler before the coating goes down. The filler bonds to both sides of the crack and stretches with future movement, so the crack doesn't telegraph back through the coating. Exceptions: structural cracks (deep, through-slab, or growing) are signs of a foundation issue that should be addressed before coating. We'll tell you on-site.
What about old paint or sealer on the floor?
Diamond grinding removes most old paint, sealers, and coatings cleanly in one pass. Stubborn cases (heavy enamel paint, deeply penetrating sealers) get an extra grind pass or a chemical degrease step before grinding. By the time the new coating goes down, the slab is bare concrete substrate.
Do you handle severely spalled or damaged concrete?
Most spalling, pitting, and minor surface damage is repairable with polymer-modified concrete compound, troweled flat, and overcoated. Severely damaged concrete (large sections lifted from frost heave, structural cracks, deep through-slab damage) is sometimes beyond restoration. A coating over a structurally bad slab buys 1-2 years before the underlying problem reappears. Dave will say if your slab needs replacement instead of restoration.
Why do you test for moisture before coating below-grade?
Below-grade slabs (basements, walk-outs, lower-level garages) transmit ground moisture upward through the concrete. High moisture causes coating delamination: the bond between coating and slab fails as moisture vapor builds up underneath. We run an MVER test before coating any below-grade surface; readings tell us whether the slab is dry enough for a standard install or needs a moisture-mitigation primer underneath. Avoids the most common cause of below-grade coating failure.

More in Star Prairie

All the services we offer in Star Prairie, WI.

Whatever the slab (garage, basement, patio, mudroom, commercial) gets the same diamond-ground prep, same polyurea + polyaspartic system, same 15-year warranty. Bundle pricing if you book multiple rooms in one visit.

Surface Prep & Repair elsewhere

Surface Prep & Repair in nearby cities.

Same diamond-ground prep, same polyurea + polyaspartic system, same 15-year warranty across our entire service area. If you're outside {city}, here's where else we install.

← See Surface Prep & Repair details and full service area

Get a quote

Ready for a surface prep & repair install in Star Prairie?

Send four photos of your slab and we'll text back a real Star Prairie number same-day. No salesperson, no quote-bot, no follow-up calls.

(715) 307-8302 Text Dave · Fastest reply
  • Free on-site measurement
  • Written 15-year warranty
FREE QUOTE

Tell us about your slab.

By submitting you agree to be contacted about your project. We don't sell your info, ever.

Text Dave (fastest) Call