Worked case: a 2,200-square-foot auto shop floor along Newport Road, oil and moisture treated, cracks repaired and joints filled — what happens and what it costs

The scenario

Imagine an independent repair garage in a one-building lot a few minutes from the I-215 interchange on Newport Road. Three bays of about 700 square feet each, plus a narrow aisle and a front counter, make roughly 2,200 square feet. Two bays have two-post lifts anchored to the slab. Over the years, motor oil, brake fluid and coolant have darkened the lanes where cars sit, and cracks fan out from the lift baseplates and between bays. The saw cuts behind the roll-up doors have chipped, and a first moisture check near the back wall comes back damp.

Because the shop pays its bills by the day, closing is out of the question. The owner wants a surface that wipes clean, gives technicians solid footing and shrugs off hot-tire marks. The lease requires the landlord's written consent for a floor change.

The starting conditions at a glance:

• Footprint: three bays plus aisle, about 2,200 square feet
• Slab condition: oil-soaked, cracked, chipped saw cuts, a damp first reading
• System: gritted solid-color epoxy
• Sequence: one bay at a time so the lifts stay in use

Reminder: How a coating holds up against specific fluids is read from the maker's chemical chart, for the exact fluid, strength and contact time, and never assumed.

What the job involves

1. The garage is divided into zones; the owner clears one bay at a time and moves or lowers the lifts, and the coating crew leaves the lifts alone.
2. Each bay is degreased and ground in repeated passes because oil left in the concrete weakens the bond; a moisture test in the first bay confirms the damp reading that triggers the moisture line.
3. A moisture-tolerant primer goes down first. Once it cures, cracks are opened, packed with flexible filler and ground level, and chipped saw-cut edges are rebuilt.
4. Pigmented epoxy is rolled in even strips, cut through directly over each saw joint, and the joints are then filled with a flexible material.
5. The bay is finished with a clear coat that holds a measured amount of grit; the data sheet sets when the lift and vehicles return.
6. The crew then shifts to the next bay and repeats the sequence, starting at dawn so the finish coat is never rolled out in afternoon heat.

Materials and prep

• Planetary grinder, wall-edge grinder, degreaser and dust extractor
• Moisture meter with a calcium chloride kit or in-slab probes
• Moisture-tolerant primer, pigmented epoxy and a gritted clear coat
• Flexible joint filler and patching mortar for broken edges
• Roller frames, squeegees, cleated shoes, fans and masking tape

Add-ons often paired with this job

• Line striping and safety markings — +$300–$900. Bay outlines and a pedestrian path are painted over the cured coating.
• Cove base up to 100 linear feet — +$1,500–$2,500. A short cove can be formed along the wall behind the counter.

Why it is done this way

Repair bays punish a floor, so the system is chosen for the harshest thing that touches it: oil and brake fluid that sit until wiped, hot tires pressing the film, and point loads from lift baseplates and jack stands. Gritted solid-color epoxy is the entry-level answer at $3–$7 per square foot; heavier systems cost more.

Two modifier lines stack. The repair line of $1–$3 per square foot covers cracks and chipped joints, and the oil and moisture line of $2–$5 covers degreasing, repeat grinding and a moisture-tolerant primer. Across 2,200 square feet the combined $6–$15 per square foot is the largest adder in this example, which explains why the total spans the $13,600–$34,200 range.

Lifts raise a different question. Coating adds no strength to concrete, and baseplates are anchored into it, so a thin or cracked slab beneath a lift is assessed or repaired before anything is rolled on.

Going bay by bay keeps the shop open. The other lifts keep working while one bay cures; the schedule choice in the estimator is a note describing how the shop runs and leaves the range unchanged. A coated floor can be slippery when wet or oily, so the amount of grit balances grip against ease of cleaning.

The alternatives that were weighed and set aside:

• Quartz broadcast at $8–$15 per square foot feels rougher and lasts longer.
• Sealer only masks stains and offers technicians little traction.

What would change the price

• A reading far above the primer's limit means more moisture work than this range covers.
• A thin or cracked slab beneath a lift is assessed and repaired before the coating.
• Shops with only one or two bays tend to land at a higher price per square foot.
• Bays full of hot-tire traffic may call for quartz broadcast instead of plain grit.
• More chipped joints than expected extend the filling line.