Short answer: Wash the car, remove iron fallout and tar, and wipe the paint with IPA to remove oils. Test in an inconspicuous area. Choose the compound based on scratch depth (light scratches → medium cut, heavy scratches → heavy cut). Work in 20 × 20 in sections at medium speed with light pressure for 4–6 passes. When finished, wipe with IPA and always apply protection. Total time: 4–6 hours for an average car.
First: can your scratch be removed?
Fingernail test: run your nail across the scratch.
- Your nail doesn't catch – the scratch is in the clear coat. Polishing removes it. That is what this guide covers.
- Your nail catches – the scratch reaches the paint layer. Polishing reduces it but won't remove it completely.
- You see primer or metal – that's a body shop job. Polishing will not help.
The fine "spider web" circles on your car (swirl marks) are almost always in the clear coat and can be fully removed by polishing. They are not paint defects but the result of years of improper washing.
What you need
- pH-neutral shampoo – to wash without scratching: Alpha Green Apple or Wash & Berry.
- Iron fallout remover – to remove embedded brake dust: Red Storm.
- Tar remover – for road tar: Orion Wax Tar & Adhesive Remover.
- Abrasive compound – does the actual correction: Final Finish Polish (767) or Extra Heavy Cut Compound (747).
- IPA (isopropyl alcohol) – to remove polishing oils. Don't skip it: DVX IPA 32 oz.
- Microfiber towels, at least 4 – a clean towel for each stage.
- Protection – to seal the corrected surface: 9H Nano Ceramic Coating or a wax.
No machine? Don't panic. It can be done by hand — slower and effective on light scratches, but not enough for heavy ones. If you use a machine, choose a dual-action (DA) polisher; rotary machines need experience and can burn paint.
Step by step
Step 1 – Wash and dry (45 min)
Wash with pH-neutral shampoo in the shade using the two-bucket method. A single grain of sand left on the surface means a new scratch while polishing. Dry by blotting with microfiber.
Step 2 – Decontaminate (30 min)
Spray iron remover, wait 3–5 minutes (the color change shows it is working), and rinse. Then treat tar spots with tar remover. If you skip this, embedded metal particles get dragged around during polishing and you create more scratches than you fix.
Step 3 – Degrease and see the real condition (15 min)
Dilute IPA 1:1 with water and wipe the surface. This removes old wax and oils — and shows the true condition of the paint for the first time. Look at the surface at an angle with a work light or phone flashlight; scratches only show at this angle.
Step 4 – Test spot (20 min)
Choose an inconspicuous 20 × 20 in area, like a corner of the trunk lid. Start with the gentlest combination: medium cut + soft pad. If the result is good enough, use it on the whole car. If not, step up to heavy cut.
Rule: always start with the least aggressive combination. You can't put paint back.
Step 5 – Work section by section (3–4 hours)
- Put 3–4 pea-sized drops of compound on the pad.
- Spread it on the surface with the machine off — starting it on will splatter.
- Start spreading at low speed (1–2), then go to medium (3–4).
- Make overlapping horizontal and vertical passes, 4–6 in total.
- Pressure: the machine's own weight plus light support. Pressing harder doesn't speed things up, it adds heat.
- Stop when the compound turns clear. Working until it dries burns the paint.
- Wipe with microfiber and check the result under light.
Order: hood → roof → trunk → side panels. Horizontal surfaces see the most sun and dirt and are usually in the worst condition.
Step 6 – Final wipe and protection (45 min)
When the whole car is done, wipe again with IPA. Oils in the compound can temporarily fill scratches; IPA reveals the real result. Any missed areas show up now.
Then always apply protection. After polishing, the paint is bare. Left like this it gets dirty faster than before.
The 6 most common mistakes
- Working in the sun. Compound dries in seconds on hot panels, doesn't work and leaves marks.
- Using a dirty pad. Clean it with a brush every 2–3 panels or swap it.
- Pressing too hard. Contact time and the right number of passes do the work; pressure only adds heat.
- Working on edges and body lines. Clear coat is thinnest on edges and burn risk is highest. Tape them off.
- Skipping the IPA step. You won't see the true result and your protection won't bond.
- Trying to fix everything at once. Clear coat is a limited resource. 85% correction is a good result; don't risk the paint for the last 15%.
FAQ
Can I polish by hand?
Yes. Hand application works for light scratches, haze and dullness; work back and forth with an applicator or microfiber pad. You can't create enough cut by hand for heavy scratches.
How often should a car be polished?
Only when needed — when haze or dullness becomes visible, typically at most once a year. Polishing every year as routine wastes clear coat.
Should a new car be polished?
Usually not, but new cars often have fine scratches from transport and the showroom. The right approach: a light correction (medium cut) followed immediately by long-lasting protection.
How many cars does 32 oz of compound cover?
A full correction on an average car uses about 3–4 oz, so 32 oz covers about 8–12 full applications.
Do all-in-one products work?
For moderate defects, yes, and they save time. Single Step Compound gives light correction and protection in one pass. Heavy scratches need separate products.
Summary
The hard part of polishing is not the application but the prep. Do the wash, decontamination and IPA steps properly and the rest is patience. Start with the gentlest combination, confirm with a test spot and always finish with protection.
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