- The prep hours
- Most of the job
- The coating itself
- Maybe a fifth of the value
- The environment
- Controlled bay for multi-year tiers
- The paperwork
- Cure rules and warranty terms, in writing
Choose a ceramic coating installer by interrogating the prep, not the product. The coating in the bottle is a minority of what you are paying for; the decontamination, machine correction, controlled environment, and aftercare instructions around it decide whether the film reaches its rating or dies in a year. Nine questions expose all of it in one phone call, and the red flags are loud once you know them. We install coatings at our own shop, so read this knowing we have skin in the game, and notice that every test in it is one we have to pass too.
You Are Buying Prep, Not Product
Here is the industry's open secret: the bottle of coating a shop uses might cost them well under a hundred dollars. What you are paying for is everything around it. Hours of decontamination and machine correction. A bay where dust and moisture cannot land on soft film. Hands that have done it enough times to know what a panel wipe missed. Instructions that keep you from ruining the work in week one.
That ratio explains almost every bad coating story on the internet. When a quote seems impossibly cheap, the prep is what got deleted, because it is the only expensive part. The film goes over embedded iron and old wax, bonds badly, and quits beading inside a year, and the owner walks away convinced ceramic is a scam. The chemistry was fine. The corner-cutting was fatal. Our lifespan guide covers that failure pattern in depth; this guide is how you avoid hiring it.
The Nine Questions
Ask these in one call or one visit. You are not testing chemistry knowledge; you are testing whether the shop's answers come out specific, fast, and unbothered.
| Ask | A good answer sounds like | Walk if |
|---|---|---|
| 1. What prep is included? | Wash, iron decon, clay, panel wipe, itemized | "We clean it first," no specifics |
| 2. Is correction done before coating? | Yes on multi-year tiers, with the level named | "The coating fills that in" |
| 3. Which product line, and why? | A named line plus real reasons they chose it | Brochure recital or a secret formula |
| 4. Where does the work happen? | Indoor controlled bay for multi-year tiers | Driveway install of a 5-plus year product |
| 5. How long will you have the car? | One to three days depending on correction | Same-day everything, any paint condition |
| 6. What are the cure rules? | Written instructions handed over at pickup | "Just drive it, it is fine" |
| 7. What does the warranty require of me? | Plain list: wash rules, inspections, what voids it | Big year number, vague terms |
| 8. Licensed and insured? | Yes, boringly, instantly | Any hesitation at all |
| 9. Exact price for my car, in writing? | A number tied to your vehicle and paint condition | A price quoted before anyone saw the car |
Question two is the installer test wearing a customer question's clothes. A coating is optically clear and lasts years, so whatever the paint looks like at application is what gets preserved, magnified, under glass. A shop willing to coat over visible swirls without mentioning correction is not saving you money; it is sealing the damage where polishing can no longer reach it without redoing everything. The scratch guide explains why that regret is the most common one in this category.
And question nine is where the whole interview lands. A real shop prices from your actual car: its size, its paint condition, how much correction it needs. A price that arrives before anyone looked at anything is not a quote. It is bait.
Red Flags That End the Conversation
Some answers are not yellow flags to weigh. They are exits. A nine-year coating installed same-day on a daily driver: the stages that make a nine-year coating real do not fit in one day. Any use of the phrase scratch-proof or rock-chip-proof: the film resists wash marring, and physics handles the rest, so a shop overselling the armor will oversell everything. A refusal to name the product line. Pressure to book today because the price expires. And the quiet one: no mention of aftercare at all, because a shop that does not tell you how to wash the car for the first two weeks is a shop that stopped caring at the invoice.
Does the Brand Matter? Less Than the Forums Think
Spend an evening on the detailing forums and you will watch grown adults go to war over System X versus Gtechniq versus Gyeon. Here is the operator's view: those are all serious products, and the daylight between them is small compared to the daylight between installers. Every reputable line performs over correct prep. Every one of them fails over skipped prep. The brand argument is fun and mostly beside the point.
What the brand question IS good for is listening to how a shop answers it. Why this line? A real answer talks about how the product levels, its cure behavior in local humidity, the manufacturer's support when something goes wrong. That is a shop that thought about it. A shop that answers with the warranty number off the brochure outsourced its thinking to a sales rep, and it will outsource your prep the same way.
Reading Reviews Like an Operator
Star ratings compress too much to be the whole test, so read reviews for evidence of process instead. Beading photos prove someone owns a spray bottle. Prep photos prove the work: correction mid-pass, paint under inspection light, taped trim. In the text, look for customers describing the walkthrough, the timeline honesty, the aftercare instructions, because careless shops skip those parts first and reviewers who got them tend to mention it.
A fairness note from a shop that is newer than some competitors: review count measures age as much as quality. A five-year-old shop with four hundred reviews and a newer one with fifty can be the same quality of hands. Specificity beats volume; a dozen reviews that describe the process in detail tell you more than three hundred that say great job. Weigh the count, then read.
Why Quotes Spread from $400 to $2,500
Get three quotes in this county and the spread can be honest or alarming, and the difference is what is inside the number. Tier of coating, amount of correction, size of vehicle, and condition of paint move the price legitimately; a black SUV with years of tunnel-wash marring is simply a bigger job than a garaged sedan six months off the lot. The cost guide breaks down every tier and what each includes, which makes strange quotes easy to diagnose: too low usually means prep deleted, too high with no correction included means you are funding someone's marketing budget.
The Honest Outs
Sometimes the right answer is not hiring anyone. If the car is a short lease and the finish just needs to survive turn-in, a consumer spray sealant a few times a year is the rational spend. One warning before anyone reads that as an endorsement of DIY ceramic kits: real coating chemistry is unforgiving in first-timer hands. High spots, streaks, and patchy cure are the standard beginner results, they show worst on dark paint, and undoing a botched application means machine polishing the whole car. A spray sealant is easy and forgiving. A true coating is not, and a garage install rarely comes out looking like a bay install. If the car lives in a brush tunnel and that habit is not changing, skip the coating entirely; the tunnel will grind off the investment. And if the paint is heavily damaged, the honest priority is correction first, coating later or never, because restored paint uncoated beats damaged paint sealed. A good installer will tell you when you are not their customer. It is one more test: shops that only ever say yes are answering their revenue, not your question.
How We Answer the Nine
Since we wrote the test, here is our exam sheet, short. Prep is itemized in every tier, and machine correction is built into the multi-year packages, a 1-step on the middle tiers and a 2-step on the premium one. The work happens in controlled bays at 8580 Spectrum Ln in Sorrento Valley, one to three days depending on the tier. Cure rules go home with you in writing. Tier pricing is published, from $299, and confirmed against your actual car before anything is booked. Licensed, insured, and a 5.0 Google rating we intend to keep earning. Bring the nine questions; we like the customers who ask them, because they already understand what they are buying.