Ceramic Coating & PPF Guide: Understand

PPF and Ceramic Coating Glossary: 50 Terms Explained

Shopping for film, a coating or a paint correction means hearing a lot of shop vocabulary in a short conversation. Some of it is chemistry, some is installer slang, and some is marketing.

This glossary defines 50 of the terms you are most likely to hear, grouped by topic, in plain words. Where a term has its own guide, the definition links to it.

By The Auto Show, Anderson, SC · Updated October 20, 2026

The short answer

Paint protection film (PPF) is a clear urethane sheet with a self-healing top coat and a pressure-sensitive adhesive, measured in mils. A ceramic coating is a liquid that cures into a thin, hard, water-repelling layer on top of clear coat. Paint correction is machine polishing that removes a thin layer of clear coat to level out defects. The terms below cover the details of all three.

Key points

Film terms describe a physical layer you can measure and remove; coating terms describe a thin chemical layer that cures in place.
Many defects, like swirls, holograms and etching, are defined by how deep they go into the clear coat.
Ratings such as 9H, 10H and rated years are manufacturer figures, not guarantees.
If an installer uses a term you do not know, ask; a good one can explain it without jargon.

Film materials

What paint protection film is made of

PPF (paint protection film): A clear or tinted urethane film applied over paint to absorb stone chips, sand, bug acids and light scratches. Removable and replaceable. What is PPF?
TPU (thermoplastic polyurethane): The flexible, tough plastic that forms the body of modern film. It stretches over curves and absorbs impact energy.
Aliphatic and aromatic: Two families of urethane chemistry. Aliphatic types are generally chosen for film because they hold their clarity in sunlight better; aromatic types are more prone to yellowing. Does PPF turn yellow?
Top coat: The thin outer layer on the film that provides gloss or matte finish, stain resistance, water repellency and the self-healing effect.
Self-healing: The top coat's ability to level light swirls and surface scratches when warmed by sun, warm water or engine heat. Deep cuts through the film do not heal. How self-healing works
Pressure-sensitive adhesive: The glue layer on the back of the film. It bonds when pressed and builds strength as it settles, yet is designed to release for removal.
Release liner: The backing sheet that protects the adhesive until installation. It is peeled away just before the film goes on the car.
Mil: A unit of thickness equal to one thousandth of an inch, or 25.4 microns. Film thickness is usually quoted in mils.
Extra-thick film: Film with a thicker urethane layer for more impact absorption, used on rockers, off-road vehicles and high-chip areas. Thicker film is harder to stretch around tight curves. Extra-thick PPF
Matte (stealth) film: Clear film with a flat or satin top coat. It turns gloss paint satin or protects factory matte paint without adding shine. Gloss vs matte PPF

Film install

Words you will hear about installation

Pre-cut pattern: Film cut by a plotter from software templates for a specific vehicle, so each piece fits a panel with minimal trimming on the car.
Bulk install: Film cut by hand from a roll and trimmed on the vehicle. It allows custom coverage and more wrapped edges, but needs a skilled installer.
Slip solution: A water and soap mixture sprayed on paint and adhesive so the film can be positioned and moved before it is squeegeed down. How PPF is installed
Tack solution: A water and alcohol mixture used to make the adhesive grab quickly in a spot, such as an edge or a curve that wants to lift.
Squeegee: A flexible tool used to push slip solution and air out from under the film and press the adhesive onto the paint.
Wrapped edge: Film folded around the edge of a panel onto its back side, so no edge line is visible from the outside. Edges explained
Exposed edge: A film edge that stops on the visible face of a panel, usually a few millimeters short of the panel edge. Common where wrapping is not possible.
Relief cut: A small, deliberate cut that lets film lie flat around a complex curve, sensor or emblem instead of bunching or lifting.
Post-heat: Warming the installed film, especially edges and stretched areas, to help the adhesive set and the film relax into shape.
Moisture pocket: A small pocket of slip solution trapped under new film. Most dry out and disappear as the film cures over the first days or weeks. PPF aftercare

Coatings

Ceramic coating vocabulary

Ceramic coating: A liquid that cures into a thin, hard, slick layer on paint, glass, wheels or trim. It makes surfaces easier to clean but does not stop chips. What is a ceramic coating?
SiO2 (silicon dioxide): Silica, the glass-like compound that most consumer and professional coatings form or contain once cured. 'Ceramic' in coating marketing usually means silica based.
Polysilazane: A silicon and nitrogen based resin used in some coatings that reacts with moisture in the air and converts toward a silica-like layer as it cures.
Carrier solvent: The liquid that keeps a coating spreadable in the bottle. It evaporates during flashing, leaving the active material behind.
Flash: The short window after application when the solvent evaporates and the coating starts to set. The surface often shows a rainbow sheen right before it is leveled.
Leveling: Wiping a flashed coating with a clean towel to remove excess and leave an even, invisible film.
High spot: A patch of coating left too thick, usually from missed leveling. It cures into a dark, smeary or rainbow mark that must be polished off. How coatings bond
Cure time: How long the coating takes to harden fully. It is touch-dry in hours but keeps hardening for days to weeks, which is why early washing is restricted. Cure time
Pencil hardness (9H, 10H): A scratch test using pencils of increasing hardness. IGL, for example, rates its Kenzo coating at up to 10H on the pencil scale. It describes the cured film, not resistance to chips. Hardness ratings
Topper: A spray product applied over a coating to refresh slickness and water beading between washes. Also called a booster. Toppers and boosters

Water behavior

Beading, sheeting and paint layers

Hydrophobic: Water repelling. On a hydrophobic surface, water pulls into round beads instead of spreading out.
Contact angle: The angle a water droplet makes where it meets the surface. Above 90 degrees counts as hydrophobic; the higher the angle, the rounder the bead. Beading and sheeting
Sheeting: Water running off a surface in a sheet rather than sitting in beads. Some coatings are designed to sheet so fewer droplets dry into spots.
Self-cleaning: Marketing shorthand for a slick surface that sheds loose dirt with rain or a rinse. It still needs regular washing.
Clear coat: The transparent top layer of modern paint, about 40 microns thick in a typical factory system. It provides gloss and UV protection, and it is what polishing removes. Paint layers explained
Base coat: The color layer under the clear. It is thin and carries pigment, metallic flake or pearl.
Primer surfacer: The layer under the base coat that smooths the body surface, helps adhesion and absorbs stone impacts.
E-coat: Electrocoat primer applied by dipping the bare body in a charged bath at the factory. It is the main corrosion barrier and is skipped in body shop refinishes.
Single-stage paint: Paint where color and gloss are in one layer with no separate clear. Common on older cars and some solid colors; it oxidizes differently. Single-stage paint
Orange peel: A gentle ripple in the paint surface, like the skin of an orange, seen in sharp reflections. Almost all factory paint has some.

Defects and fixes

Paint defects and correction terms

Swirl marks (marring): Fine, shallow scratches in the clear coat, usually from washing and drying, that look like circles around a light source. What are swirl marks?
RIDS (random isolated deep scratches): Individual scratches deeper than the general swirling. Some can be reduced by polishing; some go too deep.
Holograms (buffer trails): Hazy, rainbow-like trails left by improper machine polishing, often with a rotary polisher. They show in direct sun. Holograms explained
Etching: Damage where something acidic or baked on has eaten into or reshaped the clear coat, such as water spots, bird droppings or bugs. It does not wash off. Water spots
Oxidation: Breakdown of the paint's binder from UV, heat and moisture, showing as dullness, fading or chalky residue. Paint oxidation
Clear coat failure: Clear coat that has cracked, clouded or started peeling away. It cannot be polished or coated back to health; the panel needs repainting. Clear coat failure
Iron decontamination: A spray that dissolves embedded iron particles from brake dust and rail dust, often turning purple as it works. Iron contamination
Clay bar: A clay or synthetic clay tool glided over lubricated paint to pull out bonded contaminants a wash leaves behind. Decontamination
1-step and 2-step correction: A 1-step correction is one machine polishing stage. A 2-step adds a heavier cutting stage first, then a refining polish, to remove deeper defects. 1-step vs 2-step
Paint depth gauge: A meter that measures total paint thickness over metal. Basic gauges read the whole stack, not the clear coat alone, so they guide rather than guarantee.

Have a term we did not cover?

Ask us. We will explain what it means for your car, and show you under shop lighting what your paint needs before you book anything.

Common questions

What is the difference between PPF and a ceramic coating in one sentence?

PPF is a thick, removable urethane film that physically absorbs chips and scratches, while a ceramic coating is a very thin hard layer that cures onto the surface to make it slicker, glossier and easier to clean. Film is about impact protection; a coating is about upkeep and chemical resistance. Many owners use both: film on the front, coating everywhere.

What does 'mil' mean when talking about PPF thickness?

A mil is one thousandth of an inch, or 25.4 microns. It is the standard unit for film thickness. Thicker film generally absorbs more impact but is stiffer and harder to stretch around curves. Compare films using the maker's published total thickness and ask whether it includes the top coat and adhesive.

Is a ceramic coating the same thing as a sealant?

No. A paint sealant is usually a synthetic polymer product that sits on the paint and lasts months. A ceramic coating cures into a harder, more chemically resistant layer that lasts years with proper care, and it needs much more careful preparation and application. Both make water bead; they differ in durability and prep.

What does it mean when an installer says my paint has RIDS?

RIDS stands for random isolated deep scratches: individual scratches deeper than the general fine swirling. During a correction, the installer can usually reduce them, but some go too deep to remove safely without taking off too much clear coat. A scratch that catches a fingernail is usually in that category.

Keep reading

← All guides Next guideWhat Are Swirl Marks? →

Sources

Paint Protection Film Frequently Asked Questions, LLumar / Eastman Performance Films (https://llumar.com/en/resources/paint-protection-film-frequently-asked-questions/), accessed October 2026
Platinum Matte Paint Protection Film, LLumar / Eastman Performance Films (https://llumar.com/na/en/automotive/paint-protection-film/platinum-matte/), accessed October 2026
Ecocoat Kenzo (Graphene Reinforced), IGL Coatings (https://iglcoatings.com/products/ecocoat-kenzo-graphene-reinforced/), accessed October 2026
Talc in Automotive Coatings (application leaflet on OEM layer systems), Elementis (https://www.elementis.com/fileadmin/elementis/About_Elementis/03-businesses/Performance_Specialties/Adding_Future/Papers_Leaflets/finntalc/0102030901_Talc_automotive.pdf), accessed October 2026
Measuring Multiple Automotive Paint Layers, PCI Magazine (https://www.pcimag.com/articles/111366-measuring-multiple-automotive-paint-layers), accessed October 2026
To improve auto coatings, new tests do more than scratch the surface (NIST news release), ScienceDaily (https://www.sciencedaily.com/releases/2018/09/180920175200.htm), accessed October 2026

Prices on this page are The Auto Show’s published starting prices and are confirmed after we inspect the vehicle. Product ratings and warranty terms come from the manufacturers.

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