How to Fix Rock Chips on Car Paint (Stone Chip Repair by Depth)

To fix a rock chip on car paint, first look at what the chip reveals: if only paint is missing you can touch it up, but bare metal needs primer and orange rust must be removed before any paint goes on. Paint over rust and it keeps spreading under the repair. This guide covers a chip depth table, the order of materials, thin-coat touch-up steps taken from maker instructions, mistakes to avoid, and when a body shop is the better call.

Step 1: Assess the Chip Depth

A rock chip is a small crater where paint has been knocked off. What matters is how far down it goes. The maker pages used for this guide split the job into two cases: chips where metal is still covered, and chips where metal is exposed. Dupli-Color’s aerosol instructions say to prime only if bare metal is exposed or to fill minor imperfections, and the Mazda owner’s manual tells owners to repair stone-chip damage with touch-up paint before rust begins to form.

Wash the chip and look at it closely in daylight. Shiny silver means bare steel. Orange or brown powder means rust has already started. Neither means the chip stopped in the paint layers above the metal.

Chip depth, what you see, repair route and who should do it

The table matches each situation to the route the read sources support. Where a source gives no guidance, the table says so instead of guessing.

What you see	Likely depth	Repair route from the sources	DIY or pro
Small crater, no shiny metal and no rust, color underneath still visible	Paint layers only	Clean the chip, remove loose paint, then touch up with matching paint in thin coats and seal with clear (Dupli-Color Scratch Fix directions)	DIY with the right color code
Shiny silver metal at the bottom	Bare metal exposed	Prime first: Dupli-Color says use primer if bare metal is exposed; Rust-Oleum describes its self-etching primer as one that etches and primes bare metal in one coat	DIY for a few isolated chips
Orange or brown powder or bubbling around the chip	Rust has started	Remove the rust completely, wipe clean, apply a rust-preventive primer, let it dry fully, then top coat (Mazda owner’s manual)	DIY if small; shop if rust has spread
Paint lifting or flaking at the edges of the chip	Loose paint around the damage	Dupli-Color’s abrasive prep tip is made to remove loose paint and rust before painting	DIY for small areas; flaking over a wide area is a repaint question
Dozens of chips across the hood or a stretch of lower body	Widespread damage	No read source gives a spot-repair method for this; 3M’s rubberized anti-chip coating is marked for professional use only	Get a shop quote
Chip right at a panel seam, edge or on a plastic bumper	Different material or structure	Not covered here; plastic bumpers are handled in the bumper scratch guide linked below	Read the bumper guide or ask a shop

This page is about metal body panels such as the hood, fenders, doors and roof. If your damage is on a painted plastic bumper, use our guide to repairing scratches on a plastic car bumper instead. If the chip is in the glass rather than the paint, see how to use auto glass repair kits.

Rock Chip Repair Supplies

Gather everything first, because several products have recoat windows.

What You’ll Need

Order	Item	What the maker page says	Needed when
1	Cleaner: rubbing alcohol or Dupli-Color Prep Wipe; mineral spirits for primer prep	Dupli-Color: lint-free cloth with rubbing alcohol or Prep Wipe. Rust-Oleum: mineral spirits, then dry	Always
2	Prep tool: abrasive tip, fine sandpaper or wire brush	Dupli-Color: the abrasive tip removes loose paint and rust. Rust-Oleum: wire brush or sandpaper	Always for loose paint; for rust
3	Primer: self-etching or rusty-metal primer	Rust-Oleum: self-etching primer is for bare metal, aluminum and fiberglass; its rusty-metal primer is for heavily rusted metal	Only if metal is exposed
4	Color: touch-up pen or brush, exact-match if possible	Dupli-Color: the Scratch Fix line is exact-match by color code; the Universal pen is for when an exact match is not needed	Always
5	Clear coat	Dupli-Color: the clear coat seals and protects the repair	After color
6	Ventilation, no open flame, and a NIOSH-approved respirator if you sand old paint	Rust-Oleum: ventilated area, no open flame, NIOSH-approved respirator for lead dust when sanding old paint	Always when sanding or spraying

Step-by-Step: How to Fix a Rock Chip

The steps follow the Dupli-Color, Rust-Oleum and Mazda instructions. Where they are silent, the step says so.

Step 1: Clean the Area

Dupli-Color’s Scratch Fix directions start with a clean, lint-free cloth and rubbing alcohol or its Prep Wipe to remove oil, wax and grease. Its Universal pen page adds that the surface should be clean, dull and dry. Mazda’s manual says to remove dirt and grease with a clean soft cloth.

Find your color code now. Dupli-Color says it sits on the vehicle manufacturer’s label, most likely in the driver’s side door jamb, and that the location varies by maker and model year.

Step 2: Apply Primer (Bare Metal Chips Only)

Skip this step if no metal shows. If metal does show, Dupli-Color’s aerosol instructions say to prime when bare metal is exposed. Rust-Oleum’s data sheet describes its self-etching primer as a rust preventive coating that etches and primes bare metal in one coat. Its prep is to clean with mineral spirits, let the surface dry, and lightly sand with #400 grit sandpaper kept wet.

If there is rust, remove it first. Mazda’s manual says to remove rust completely with sandpaper, wipe with a clean cloth, apply a rust-preventive primer, and let it dry completely before the top coat. Rust-Oleum’s separate rusty-metal primer is for heavily rusted metal and asks you to remove loose paint and rust with a wire brush or sandpaper first.

Use the primer outdoors or in a ventilated space, away from open flame. The Rust-Oleum self-etching primer data sheet also warns that scraping or sanding old paint can release lead dust, and says to wear a NIOSH-approved respirator and clean up with a HEPA vacuum and a wet mop. The data sheets describe spray cans and say to cover surrounding areas; neither describes a brush-on primer method for a tiny chip.

Rust-Oleum says 2 or 3 thin coats about 2 minutes apart for its self-etching primer, with a top coat after 30 minutes at 70 °F and 50 percent humidity. Its rusty-metal primer says top coat within 1 hour or after 48 hours, so read your can.

Step 3: Apply Touch-Up Paint in Thin Layers

Shake a Universal pen for 20 to 30 seconds. Dupli-Color then says to prime the paint flow by pressing the pen tip up and down on a hard test surface until paint flows, and to guide the tip across the chip. Use the pen tip for fine marks and the tapered brush for larger chips. For the Scratch Fix tool, twist the grip counter-clockwise to reach the brush and apply paint evenly in one direction.

Dupli-Color recommends 1 to 2 coats with a recoat window of 30 minutes to anytime. Rust-Oleum’s primer sheets say several light coats beat one heavy coat. Dupli-Color says to work between 60 and 95 °F with low humidity.

Step 4: Let Paint Cure Fully

No maker page read for this guide states a full-cure time, only recoat windows, so that is all this guide quotes. An older version of this page said to wait 3 to 4 days before clear coat; that figure was removed because no read source supports it.

Step 5: Apply Clear Coat

Dupli-Color’s Scratch Fix pen carries a clear top coat tip: twist the clear applicator grip counter-clockwise from the base and apply the clear evenly in one direction, allowing 30 minutes for any additional coats.

Step 6: Clean Up and Leave It Alone

Dupli-Color says to wipe the pen tip with a lint-free cloth after each use, cap it and store it in a cool, dry place. No read page gives a grit or polish method for finished touch-up paint, so an older tip to wet-sand with 2000 grit was removed.

What the Maker Pages Do and Do Not Say

Rock chip advice online often repeats numbers that no paint maker prints. This table checks the common ones against the pages read for this guide.

Common claim	What the read sources say
Wait 3 to 4 days before clear coat	Not stated. Dupli-Color lists a recoat of 30 minutes to anytime for its pens
Wet-sand finished touch-up with 2000 grit	Not stated. Rust-Oleum gives a #400 wet-sand step for its primer only
A rock chip repair costs a fixed amount	No read page gives a repair cost. As of October 14, 2026 the Universal Silver pen in the box was listed at $17.35 on Amazon, and prices change
Always prime	Only when metal is exposed, per Dupli-Color; the Scratch Fix pen is described as a one-coat prime and paint formula
Any touch-up color works	Dupli-Color says exact-match colors are tied to the vehicle color code; the Universal pen is for when an exact match is not needed
Paint over the rust and seal it	Mazda says to remove rust completely, then prime with a rust-preventive primer

Touch-Up Paint Pen vs. Kit: Which Is Better?

Dupli-Color’s line has three tiers; the right one depends on chip size and color accuracy.

Product type	What it includes	Best fit
Universal Touch Up Pen	Prep tip that removes rust and loose paint, a pen tip for fine scratches and a tapered brush for larger chips; lacquer, 0.5 fl oz	Minor chips when an exact color match is not needed, on metal or pre-painted surfaces
Scratch Fix All-in-1	Abrasive prep tip, one-coat prime-and-paint formula, pen tip, brush end and a clear coat tip; 0.25 fl oz paint plus 0.25 fl oz clear	Small chips where you want an exact OEM-approved color by paint code
Perfect Match aerosol	Prime it, paint it, protect it with clear; acrylic lacquer aerosol	Larger repairs, per Dupli-Color

A pen is a good fit for a handful of isolated chips. Our guide to touching up car scratches covers the same pens on linear scratches, and applying clear coat goes deeper on the sealing step. If you are still choosing a color product, see best touch-up paint for cars.

DIY vs. Professional Repair

Keep the job at home when the chips are few, small and clearly isolated, the color code is known, and any rust is limited to the chip itself. Mazda’s manual says there is no problem assigning the work to an expert repairer if you prefer, and it names an authorized dealer repairer.

• Rust has spread past the chip or the paint is bubbling around it: remove rust completely or let a shop do it. Our guides to fixing small rust spots and how to fix rust on a car cover the rust side.
• Chips are scattered across the hood or lower body: the read sources give no spot-repair method for that, and 3M’s anti-chip coating is for professional use only.
• You need to sand old paint: lead dust is a stated hazard on the Rust-Oleum data sheet, with a NIOSH-approved respirator and HEPA cleanup.
• The chip is on the hood edge and you want a fuller walkthrough: see fixing paint chips on a car hood.

Common mistakes

Mistake	Why it matters	Source
Painting over rust	Rust keeps spreading under the paint; remove it completely first	Mazda owner’s manual
Skipping primer on bare metal	Dupli-Color says to prime when metal is exposed; Rust-Oleum describes a primer that etches and primes bare metal	Dupli-Color, Rust-Oleum
One heavy coat	The primer data sheets call for several light coats	Rust-Oleum data sheets
Painting in the wrong weather	Stated ranges are 60 to 95 °F for Dupli-Color pens and 50 to 90 °F with humidity below 85 percent for Rust-Oleum sprays	Dupli-Color, Rust-Oleum
Not testing the pen flow	Dupli-Color says to press the tip on a hard surface until paint flows before using it on the chip	Dupli-Color
Guessing the color	Exact-match colors are tied to the paint code on the maker label	Dupli-Color

Frequently Asked Questions

How long does touch-up paint take to dry?

The pages read give recoat windows, not a full-cure time: Dupli-Color lists 30 minutes to anytime for its pens. Follow the label on your product.

Where do I find my car’s paint code?

Dupli-Color says the color code is on the vehicle manufacturer’s label, most likely in the driver’s side door jamb. If you cannot find it, Dupli-Color suggests contacting a dealership.

Can I fix a rusty rock chip myself?

A small one, yes, if you remove the rust completely, then prime with a rust-preventive primer and top coat, as the Mazda owner’s manual describes. If rust has spread beyond the chip, a body shop is the safer route.

Do I need clear coat for a rock chip repair?

Dupli-Color’s Scratch Fix tool includes a clear coat tip that seals and protects the repair, and its aerosol system ends with a clear coat step.

Can I fix a lot of rock chips at once?

The sources read here describe spot repair with pens and aerosols and give no method for dozens of chips. 3M’s rubberized anti-chip coating is marked for professional use only. For widespread chipping, get a shop quote.

How do I prevent future rock chips?

No maker page read here gives a do-it-yourself prevention method; 3M’s anti-chip coating for lower body areas is for professionals. Our page on protective film for cars is a starting point if you want to research film.