Car scratches are one of the most common — and most frustrating — problems for any car owner in Portugal and Spain. Some are invisible to the naked eye. Others jump out at you as soon as the sunlight hits the bodywork. The good news: most can be fixed at home, without special tools. This guide shows you exactly how to remove scratches from your car, from diagnosis to final paint protection.
What You Will Learn In This Guide
- The two types of scratches owners encounter
- The fingernail test — the diagnosis that decides everything
- How to remove superficial scratches at home
- Deeper scratches — what can be done
- Protecting the paint after removing scratches
- When you should go to a professional
The Two Types of Scratches Owners Encounter
Most people can't see the micro-scratches and swirls caused by incorrect washing techniques — they simply assume it's the paint's normal appearance. What people easily identify are linear scratches: vertical, horizontal, in a line. They are easier to spot because light reflects off them directly.
Micro-scratches and swirls accumulate over time and make the paint dull and lacking depth. Linear scratches are usually caused by external factors: door dings from neighbouring cars, shopping carts, bicycles, flora (branches and bushes), clothing buttons, vandalism or simple carelessness in traffic. Each has a different solution — so diagnosis is the first step.
The Fingernail Test: The Diagnosis That Decides Everything
Before trying anything, do this: wash the affected area with quality car shampoo and good washing technique — consult our guide to scratch-free car washing and the two-bucket method to ensure you don't create more scratches during cleaning.
Once washed and dried, run your fingernail gently along the scratch. Two possibilities:
- Your nail glides without feeling anything — the scratch is superficial. You can fix it at home with polishing compound.
- Your nail catches or feels a depression — the scratch has penetrated to the primer layer or metal. It needs professional intervention.
The worst thing you can do before this test is try to rub the scratch with your hand or a dry cloth. It solves nothing — and almost always makes the situation worse.
How to Remove Superficial Scratches at Home
If your nail glided without feeling anything, you have the green light. The process is simple and quick:
- The area is already clean from the diagnostic wash — you don't need to wash again.
- Apply a small (pea-sized) drop of polishing compound to a foam applicator or microfiber cloth.
- Gently rub the scratched area with circular or light linear motions.
- You will witness the scratch removal in real time — it's one of the most satisfying moments in detailing.
- Wipe off the compound residue with a clean, soft microfiber cloth.
For light scratches, 3D One All-in-One is ideal — it cuts, polishes, and leaves a layer of protection in one step. For slightly deeper but still superficial scratches, Nasiol CleaRub 505 offers more cutting power with a refined finish.
Also consult our complete guide to car paint polishing to deepen your technique.
Deeper Scratches: What Can Be Done
If your nail caught in the scratch, the clear coat has been penetrated. In this case, the ideal job is entrusted to a professional — who has the right tools to sand, polish, and even out the paint without causing additional damage.
An experienced detailer can visually improve deep scratches by 70 to 80% through a two-step polishing process:
- Heavy cut — with Nasiol Heavy Cut Blue (light paint) or Nasiol Heavy Cut Red (dark or metallic paint), to remove material from the clear coat around the scratch and even out the surface.
- Refinement and finish — with Nasiol CleaRub 505 to eliminate cutting marks, followed by Nasiol CleaRub 705 for a perfect mirror finish.
A determined DIYer can attempt this process at home, but it requires knowledge of the polishing machine, correct pad selection, and pressure control. Without experience, it's easy to create more damage than you solve. Consult our guide to removing paint micro-scratches to understand the limits of DIY.
For scratches that reach the metal — where corrosion or base coat is visible — only professional color retouching, sanding, and painting will definitively solve the problem.
Protecting the Paint After Removing Scratches
After the paint is corrected, protection is the most important step. Without it, new scratches appear much faster.
The most effective protection currently available is a 10H hardness ceramic coating like Nasiol ZR53 — capable of lasting several years and creating a much more resistant surface to everyday superficial scratches. The other option is paint protection film (PPF), which absorbs slight physical impacts.
It's important to be honest: both ceramic coating and PPF protect against superficial scratches. Neither protects against scratches caused by forceful impact — a key, a bicycle, or a fast-moving shopping cart. The goal is to reduce the accumulation of everyday micro-scratches and make cleaning safer. Consult our complete guide to paint protection after detailing to choose the best option for your car.
See also our complete collection of car polishing products available for Portugal and Spain.
When Should You Go to a Professional?
The honest answer: whenever in doubt. A professional detailer offers a free, no-obligation evaluation. Everything has a solution — the question is simply to understand what the right solution is for each situation.
The International Detailing Association (IDA) is the global reference for finding trusted certified professionals.
If you are in Madeira Island, Detaildawg Auto Spa offers free evaluation and mobile service — no travel, no complications.