A rock kicks up off Deerfoot Trail. You hear the crack. Now you're looking at a small star on the glass, and you want to know one thing before you book anything — how much of your day does this cost?
Not much. A rock chip repair is one of the fastest services in auto care. Here's exactly how the time breaks down, why you don't lose a full day to it, and what can make a short job take longer.
What happens in the 20–30 minutes?
The repair itself is a sequence of four steps, each with a fixed time window. None of them are skippable, but none of them are long either.
1. Inspection and cleanout — 3–5 minutes. The technician checks the chip under light, identifies the type (bullseye, star, combination, or surface pit), and vacuums out moisture, dust, and loose glass fragments. Calgary's spring gravel season leaves a lot of grit packed into fresh chips — clean prep matters here more than most places.
2. Resin injection — 8–12 minutes. A pressurized bridge tool is clamped over the chip. Vacuum removes trapped air. Then clear resin is forced into the break under pressure so it reaches every crack leg.
3. UV curing — 5–8 minutes. A UV lamp hardens the resin. This is where the structural bond happens. The glass returns to 80–95% of its original strength, depending on the chip type and how quickly you brought it in.
4. Pit fill and polish — 2–5 minutes. A final bead of pit resin is added on top, cured again, then scraped and polished flat. The surface is left smooth enough that your wipers won't catch it.
Total active time on your vehicle: under 30 minutes for a single chip. Two chips in one visit adds 5–10 minutes, not double.
Why does it take that long — and not longer?
The limit isn't the repair. It's physics.
Resin needs a specific viscosity to flow into the crack legs. Calgary's cabin temperature after a Chinook morning, or a cold snap at −20 °C, both shift that viscosity. A good tech waits for the vehicle to come within working range before injection — usually 5–10 °C surface temperature on the glass. Rushing this is the main reason some fast repairs fail within a month.
UV cure time is also fixed. Lamps are rated for a specific wattage; the resin manufacturer sets the cure window; you don't get to negotiate with the resin. Under-cured resin stays soft and eventually fails during a freeze-thaw cycle.
A reputable Calgary technician won't cut either step. If your quote says "10-minute repair" — walk away. That's a sign corners are being cut somewhere.
Can you drive immediately after?
Yes. That's one of the main advantages of chip repair over replacement.
| Service | Active time | Drive-away time |
|---|---|---|
| Rock chip repair | 20–30 min | Immediate |
| Windshield replacement | 60–90 min | 1–24 hrs (adhesive cure) |
Repair uses UV-cured resin — it's solid the moment the lamp turns off. Replacement uses urethane adhesive, which needs hours to reach safe drive-away strength. If you need to be back on Stoney Trail, Glenmore, or Crowchild within the hour, repair is the only realistic option.
We do recommend two small caveats for the first 24 hours: avoid an automated car wash (the high-pressure jets can stress a fresh pit fill), and skip any extreme temperature shock like blasting cold AC onto sun-heated glass. Normal driving is fine.
What can make the job take longer?
A few situations stretch a 25-minute repair to 40–60 minutes:
Multiple chips across the windshield. Each additional chip adds 5–10 minutes. A windshield with three hits from a single gravel truck encounter might take 45 minutes total — still faster than lunch.
Contaminated chip. If you washed the car, drove through rain, or waited weeks before booking, moisture and road film get deep into the break. Cleaning that out properly adds 5–15 minutes. This is the most common reason chips "don't look as clean after repair" — the prep was rushed, not the fill.
Edge cracks or chips near the frit band. Chips within 50 mm of the black border are structurally more demanding. Some require a slower, lower-pressure injection. Others are too close to the edge to repair safely and need replacement instead.
Temperature extremes. On a −25 °C morning or a +28 °C summer afternoon, a mobile technician will spend a few extra minutes getting the glass into working range before injection. This is why we sometimes pre-warm or shade the vehicle before starting.
Weather is also the main reason we sometimes reschedule mobile appointments. Resin doesn't cure well below 0 °C ambient, and pressure injection doesn't work in heavy rain. Calgary winters mean roughly 3–5 reschedule days per year on our side — we'll always tell you in advance.
How long from booking to back on the road?
End-to-end, most customers are done within 24–48 hours of booking.
Book online through Square. Pick a morning or afternoon window in the next day or two. We arrive at the address you gave us — driveway, condo lot, office parking — and the repair is finished before your coffee cools. No drop-off, no courtesy car, no half-day at a shop.
If you're comparing to a traditional auto-glass shop: those typically need you to drive to them, wait in a lobby 45–60 minutes, and then drive back. Mobile saves the round trip and the wait.