GOI paste is a legendary product that has been used for polishing metal surfaces for almost a century. Created in the 1930s by the State Optical Institute (hence the acronym), this paste was originally intended for processing optical glasses, but quickly found application in the automotive field. Today it remains one of the most affordable and effective tools for restoring the shine of the body, removing minor scratches and oxidation.
However, working with GOI paste requires knowledge: improper use may not only fail to produce results, but also damage the paintwork. In this article, we will look at everything you need to know about this product - from choosing the right type to professional polishing techniques used by body repair specialists. You'll learn how to avoid common mistakes, what tools you'll need, and how to achieve a mirror-like shine without the risk of ruining your car.
What is GOI paste and how does it work?
GOI paste is an abrasive composition based on chromium oxide (Cr₂O₃), which is mixed with fatty and binding components. It is chromium oxide that gives the paste its characteristic green color and provides its polishing properties. Depending on the size of the abrasive particles, the paste is divided into several types, each of which is designed for specific tasks.
When polishing a body, GOI paste operates on the principle of micro-grinding: abrasive particles remove the thinnest layer of varnish or paint, eliminating irregularities, scratches and oxidation. At the same time, the fat base smoothes the surface, giving it shine. It is important to understand that the paste does not restore deep damage - it only works with surface defects no more than 5-10 microns.
- 🔬 Composition: chromium oxide (up to 80%), stearin, kerosene, fatty acids, silica gel.
- 🎨 Color: from dark green (coarse abrasive) to light green (fine abrasive).
- ⚗️ Properties: waterproof, heat-resistant (withstands up to +200°C), non-toxic after drying.
Interesting fact: GOI paste is still produced according to the original recipe from the 1930s, but modern versions may contain additional additives to improve gliding or anti-corrosion properties. For example, some brands add polymer resins, which temporarily protect the treated surface from moisture.
Types of GOI paste: which one to choose for your car?
GOI paste is available in four main versions, which differ in the size of the abrasive particles. Not all are suitable for a car body - the wrong choice can lead to new scratches or dullness of the varnish. Let's look at each type in detail:
| Marking | Color | Abrasive size (µm) | Purpose | Applicability for cars |
|---|---|---|---|---|
| Rough (No. 4) | Dark green | 40-28 | Removing rust, severe oxidation, deep scratches | ❌ Not recommended (risk of damage to paintwork) |
| Medium (No. 3) | Green | 17-10 | Metal polishing, removal of medium defects | ⚠️Only for matte or heavily damaged surfaces |
| Thin (No. 2) | Light green | 7-1 | Final polishing, removing minor scratches | ✅ Optimal choice for the body |
| Very thin (No. 1) | Light green (almost white) | 0,5-0,1 | Finishing to a mirror shine, removing microdamages | ✅ For finishing |
For most cars the best choice will be GOI paste No. 2 — it is soft enough not to damage the varnish, but at the same time effective against minor scratches and abrasions. Paste No. 1 is used for final polishing after treatment No. 2 to achieve maximum shine. Pastes No. 3 and No. 4 should be used only in extreme cases - for example, to remove rust from chrome parts or restore headlights.
⚠️ Attention: GOI paste No. 4 can leave visible marks on the paintwork even when used carefully. If you are a beginner, start with paste No. 2 and only after gaining experience move on to more abrasive options.
There are also modified versions GOI pastes from different manufacturers, for example, PASTA or Autosol. They may contain additional components to facilitate polishing, but essentially repeat the properties of the original paste. The main thing when choosing is to pay attention to the size of the abrasive, and not to the brand.
Preparing the body for polishing: step-by-step instructions
Polishing with GOI paste without preliminary preparation of the body is not only ineffective, but also dangerous. Dirt, sand or wax residue can act as an abrasive and scratch the varnish when rubbed. To avoid this, follow the checklist:
☑️ Preparing the body for polishing
Pay special attention degreasing surfaces. Isopropyl alcohol (concentration of at least 70%) or special auto degreasers, for example, are suitable for this. Sonax Xtreme or 3M General Purpose Adhesive Cleaner. Apply the product to a microfiber cloth and wipe the body in a circular motion, avoiding strong pressure.
If there are deep scratches on the body (that catch with a fingernail), GOI paste will not cope with them. In such cases, preliminary abrasive processing using polishing pastes with coarser grains (for example, 3M Rubbing Compound) or even local painting. GOI paste is effective only against microdamages up to 5 microns thick - this is approximately the thickness of a human hair cut lengthwise into 10 parts.
⚠️ Attention: Never polish the body in direct sunlight! A heated surface speeds up the drying of the paste, which leads to an uneven result and may leave streaks. The ideal temperature for work is +15...+25°C.
Polishing technique with GOI paste: from theory to practice
There are two main methods of polishing with GOI paste: manual and machine. The manual method is suitable for small areas or beginners, while the machine method is suitable for professional treatment of the entire body. Let's consider both options in detail.
Hand polishing
For hand polishing you will need:
- 🧴 GOI paste No. 2 (main) and No. 1 (for finishing).
- 🧻 Soft flannel or microfiber rag (lint-free!).
- 💧 Solvent or white spirit to dilute the paste.
- 🧤 Rubber gloves (the paste is difficult to wash off the skin).
Instructions:
- Apply a small amount of paste (about the size of a pea) to a rag.
- Rub the paste over the surface in a circular motion with light pressure.
- As it dries, add a few drops of solvent to maintain glide.
- Polish the area until the defects disappear (usually 2-3 minutes per 30x30 cm area).
- Remove any remaining paste with a clean cloth soaked in white spirit.
Machine polishing
For machine polishing use rotary or orbital polisher with a soft circle (for example, 3M Perfect-It or Meguiar’s Soft Buff). This method is 3-4 times faster than the manual method and gives a more uniform result, but requires experience.
Key rules for machine polishing:
- 🔄 Use a speed of 1000-1500 rpm (for beginners no more than 1200).
- 🌀 Movements must be cross (horizontal + vertical passes).
- 🛑 Do not keep the car in one place for more than 2-3 seconds.
- 💦 Regularly wet the circle with water or special lubricant (3M Lubricant).
To check the polishing result, use the “reflection test”: shine a flashlight at an acute angle - if the scratches have disappeared, you will see a clear reflection of the light without distortion.
After machine polishing, be sure to apply protective layer - wax or ceramic coating. This will prolong the shine effect and protect the varnish from UV rays. Popular options: Turtle Wax Ice Seal N Shine (synthetic wax) or Gyeon Ceramic Coating (ceramics).
Typical mistakes when polishing with GOI paste and how to avoid them
Even experienced car owners sometimes make mistakes that ruin all their efforts. Here are the most common mistakes and ways to prevent them:
- Using dry paste. GOI paste should be slightly damp for even glide. The dry paste acts like sandpaper and leaves new scratches.
⚠️ Attention: If the paste begins to clump or stick to the surface, dampen a rag with solvent and repeat the treatment.
- Pressing too hard. The paste works due to the abrasive, not friction. Excessive pressure leads to overheating of the varnish and the appearance of “holograms” (micro-scratches).
- Polishing a dirty body. Sand and dust act as an abrasive and increase damage. Always wash and degrease the surface before work.
- Ignoring stages. Skipping the final polish with paste #1 after polishing #2 leaves a dull finish. Always finish the process with a fine paste.
- Working in the sun. Heated varnish becomes softer and more easily damaged. Polish in the shade or in the garage.
Another common mistake is using household rags instead of professional napkins. Cotton or terry fabrics leave lint and micro-scratches. The best option is microfiber with a density of 300-400 g/m² (for example, Chemical Guys Microfiber).
What to do if streaks appear after polishing?
If white streaks remain after polishing, this means that the paste was not completely removed. Wipe the surface with a rag soaked in white spirit, and then apply protective wax. If streaks do not disappear, repeat finishing polishing with paste No. 1 with less pressure.
Alternatives to GOI paste: when should you choose another product?
Although GOI paste is universal, in some cases it is more advisable to use specialized formulations. Let's consider when to give preference to alternatives:
| Situation | Recommended remedy | Advantages over GOI |
|---|---|---|
| Deep scratches (to the ground) | 3M Rubbing Compound | More aggressive abrasive for surface leveling |
| Matte plastic (bumpers, moldings) | Meguiar’s PlastX | Does not contain chromium oxide, safe for plastic |
| Ceramic coating | Gyeon Ceramic Polish | Does not disturb the structure of ceramics, restores hydrophobicity |
| Quick polishing before sale | Sonax Profiline Polish | Easier to apply and wash off, gives temporary shine |
GOI paste remains the best choice for restoration of old varnish, removal oxidation from chromium or glass polishing (for example, headlights). However, for modern cars with multi-layer paint coatings (basecoat/clearcoat) it is better to use non-abrasive polishes based on dimethicones, which do not remove the varnish layer, but fill microdamages.
If you are working with matte paint (for example, on Mercedes-Benz Designo or Audi Nardo Grey), GOI paste is contraindicated - it will disrupt the texture of the coating. In this case, use specialized tools, for example, Dr. Beasley’s Matte Paint Polish.
GOI paste is an ideal choice for restoring shine on old or oxidized surfaces, but for modern cars with a thin layer of varnish it is better to use gentle polishes without abrasives.
Professional secrets: how to achieve an ideal result?
Body repair experts know a few tricks that help achieve a mirror-like shine with minimal effort. Here are some of them:
- 🔥 Heating the pasta.
- 🧲 Magnetic test. To check the quality of polishing, attach a magnet (for example, from a speaker) to the body. If it slides without resistance, the surface is perfectly smooth.
- 🌈 Colored paste. For visual control, add a few drops to the GOI paste. food coloring. This will help you see the untreated areas.
- 🛠️ Two-stage processing. First, polish the body with paste No. 2 with a machine, then manually polish it with paste No. 1 - this will eliminate even microscopic defects.
For polishing chrome parts (for example, moldings or exhaust pipes) use GOI paste No. 3, but be sure to complete the treatment with paste No. 1. Chrome is more resistant to abrasion than varnish, but still requires care. After polishing, apply to chrome anti-corrosion coating, for example, WD-40 Specialist.
If you polish old headlights made of polycarbonate, pre-treat them UV protective varnish after polishing. This will prevent clouding for 1-2 years. Suitable products: 3M Headlight Lens Restorer or Sylvania Headlight Restoration Kit.
FAQ: Answers to frequently asked questions about GOI paste
Is it possible to polish a new car with GOI paste?
No, GOI paste is not recommended for new cars (up to 3 years old). Modern paint coatings have a thin layer of varnish (about 40-60 microns), and the abrasive paste can damage it. For new cars, use non-abrasive polishes, e.g. Meguiar’s Ultimate Polish.
How to remove GOI paste residues from plastic parts?
GOI paste can leave green marks on plastic. To remove them, wipe the surface with a cloth soaked in solution of vinegar and water (1:1), then rinse with water. For stubborn stains, use Cleaner for Plastic from Sonax.
How much does GOI paste cost and where can I buy it?
The price of GOI paste depends on the volume and manufacturer:
- 50 g jar (original) - 150-300 rubles.
- 200 g jar - 400-600 rubles.
- Professional paste (1 kg) - 1500-2500 rubles.
You can buy it in auto chemical stores (AutoMagnat, AutoSpetsCenter), on marketplaces (Ozon, Wildberries) or in business departments (for example, Leroy Merlin). Pay attention to the labeling - fakes are often sold without indicating the paste number.
Is it possible to polish car windows with GOI paste?
Yes, GOI paste No. 1 or No. 2 is suitable for polishing glass, including windshield glass. It is effective against microdamage caused by wipers or sand. However, after treatment, be sure to apply hydrophobic coating (for example, Rain-X), since the paste removes the factory protection of the glass.
How to store GOI paste so that it does not dry out?
GOI paste is afraid of drying out and high temperatures. Optimal storage conditions:
- Temperature: +5...+25°C.
- Humidity: not higher than 70%.
- Container: hermetically sealed jar (you can wrap the lid with cling film).
- Shelf life: 3-5 years in original packaging.
If the paste is dry, it can be diluted a drop of machine oil or white spirit, but the quality of polishing will deteriorate.