How does PPF keep a stone from chipping the paint?
PPF works by putting a tough, flexible layer between the stone and the clear coat. The stone’s impact lands on the film instead of the paint.
LLumar describes its film as urethane under a protective top coat, and its Platinum Gloss page lists flying rocks, road salt and sand among the hazards the film is made for. That’s what a Lower Mainland front end meets every winter: small grit thrown up by the car ahead, sand and salt from road maintenance, and the odd stone flicked off a shoulder.
Self-healing is a separate feature with a narrower job. LLumar’s FAQ says “the majority of surface scratches” heal with heat from the sun, warm water or a warm engine. A stone that cuts into the film is not a surface scratch, and it won’t heal.
How big are the stones on BC highways?
Most winter grit on BC’s main highways is 2.36 to 4.35 mm across, and no piece may be over 9.5 mm, which TranBC, the provincial transportation ministry’s blog, calls “smaller than a Cheerio.” Its limits for winter abrasive:
| Road | Largest piece allowed | Most of the mix |
|---|---|---|
| Main provincial highways | 9.5 mm | 2.36 to 4.35 mm |
| Less-travelled paved highways | 12.5 mm | Not stated |
TranBC itself says the mix is sized to keep “windshield chips and paint dings to a minimum”, not to eliminate them. It also points out that screened abrasive isn’t the only thing out there: rocks get washed onto the highway from the roadside, fall from trucks, or get knocked onto the road by wheels grazing unpaved shoulders. Those are the bigger stones that test any film. Closer to home, the City of Langley uses salt or a salt and sand mix during snow events, and the salt and sand mix in steep locations.
Why does speed matter more than stone size?
A stone’s energy grows with the square of its impact speed, so a small rise in speed means a much harder hit. TranBC puts it plainly: a stone that hits at 110 km/h carries almost twice the energy of one that hits at 80 km/h.
| Impact speed | Energy compared with 80 km/h |
|---|---|
| 50 km/h | 0.39 × |
| 80 km/h | 1.00 × |
| 100 km/h | 1.56 × |
| 110 km/h | 1.89 × |
| 120 km/h | 2.25 × |
The table is the arithmetic behind TranBC’s statement: energy scales with speed squared, so 110 ÷ 80, squared, is about 1.89. TranBC is writing about windshields, but the same physics applies to a bumper or a hood. That’s why a daily Highway 1 commute is hard on a front end, and why film on a highway car earns its keep.
What can’t PPF stop?
PPF stops the everyday grit; it doesn’t make a car bulletproof. Four limits are worth knowing before you buy.
A big stone at speed
A large or sharp rock can cut through the film, and a hard enough hit can still mark the paint beneath it or dent the panel. Film spreads the blow of a small stone; it can’t absorb everything.
Panels without film
Film only protects the paint it sits on. With a partial front, the rear part of the hood and fenders is bare paint, and no front package covers the rocker panels behind the front wheels.
Chips that were there first
Clear film over an old chip keeps the chip, sealed in and visible.
What the warranty covers
Platinum carries LLumar’s 10-year limited warranty, and what the shop says it covers is yellowing, cracking, bubbling and peeling. Those are film defects; a stone cutting the film isn’t one of them.
Which panels take the most rock hits?
The front bumper, the leading edge of the hood, the headlights and the mirrors take most of the stones thrown back by traffic ahead. LLumar’s own FAQ lists the areas that “receive the most punishment” as the front bumper, hood and rocker panels.
| Panel | Why it’s hit | Covered in |
|---|---|---|
| Front bumper | Lowest and furthest forward, facing the spray head-on | All packages |
| Leading edge of the hood | Next surface up from the bumper | All packages (whole hood from Full Front) |
| Headlights | Face straight into the spray | All packages |
| Side mirrors | Stand out into the airflow | All packages |
| Front fenders | Front corners catch spray past the bumper | Partly in Partial Front, fully from Full Front |
| Rocker panels | Low, behind the front tires | Track Package and Full Vehicle |
| A-pillars and front of roof | Hit on gravel roads and track days | Track Package and Full Vehicle |
The difference between the first two packages is explained in partial vs full front PPF. If your driving includes gravel roads, the Track Package adds the rockers, A-pillars and part of the roof.
What about rock chips in the windshield?
PPF doesn’t protect the windshield here: Brookswood Tint doesn’t install exterior windshield protection film, so a windshield chip is a job for a glass repair facility.
In BC: ICBC Comprehensive coverage includes free windshield repairs when, among other conditions, the damage is “smaller than a loonie”, and chip repairs are only covered at an ICBC-approved Glass Repair Program facility. You pay a deductible only if the windshield has to be replaced.
TranBC’s advice is to have a windshield chip fixed right away. Its tips for avoiding chips in the first place work for paint as well: keep your distance from the vehicle ahead, and stay back from a truck spreading winter abrasive rather than passing it.
How do you protect the front of your car from chips?
Cover the panels the stones actually hit, and match the coverage to how fast and how far you drive. At Brookswood Tint that means LLumar Platinum in one of four packages:
- Partial Front, from $850: the surfaces that meet stones first: bumper, headlights, mirrors and a forward strip of hood and fenders. Usually one day.
- Full Front, from $1,550: adds the rest of the hood and both fenders. One to two days.
- Track Package, from $1,900: full front with rocker panels, A-pillars and part of the roof. One to two days.
- Full Vehicle, from $4,000: film on the whole car, every painted surface and both headlights. Three to five days.
Prep comes first: decontamination, plus correction if the paint needs it. Prices are starting figures that rise with vehicle size, trickier panels and the paint’s condition. If you’re still weighing the cost, read whether PPF is worth it for your situation, or request a quote with your year, make and model.
