Car painting metallic paint - a process that requires not only skill, but also precise adherence to technology. One of the key steps is to properly dilute the paint before application. Not only the appearance of the coating, but also its durability depends on the choice of solvent and compliance with the proportions. Incorrectly thinned paint can cause loss of shine, uneven spraying or even peeling in a few months.
Many car owners are faced with a dilemma: how to dilute metallicto preserve its unique properties? There is no universal answer - the choice depends on the type of paint, painting conditions and even the make of the car. In this article we will look at all the nuances: from types of solvents to practical tips for dilution, including proportion tables and common mistakes to avoid.
We will pay special attention to the issue of compatibility: not all solvents are suitable for acrylic metallics or alkyd enamels. We will also consider how temperature and humidity in the garage affect the final result. If you're painting your car for the first time, these instructions will help you avoid costly mistakes.
Before moving on to practical recommendations, remember: thinning paint is more than just adding liquid. This is a chemical process that requires an understanding of the properties of the components. For example, too thin paint will run off, and too thick paint will form shagreen. Next, you will learn how to find a middle ground.
1. Types of solvents for metallic paint: which one to choose?
Solvents are divided into several types, and their choice depends on the composition of the paint and the painting conditions. Main categories:
🔹 Universal solvents (for example, P812 or R-12) - suitable for most acrylic paints, but may reduce the shine of metallic paints if used incorrectly.
🔹 Specialized solvents (for example, MS for metallics) - designed specifically to preserve the metallic effect, but are more expensive.
🔹 Fast, medium and slow solvents — the choice depends on the room temperature. At +15°C medium is suitable, at +30°C - slow so that the paint does not dry too quickly.
For acrylic metallics the most commonly used solvents are based on acetate or xylene, and for alkyd - with the addition white spirit. Important: never mix different types of solvents - this can lead to paint delamination.
Paint manufacturers (eg. Mobihel, Sikkens, Dupont) usually indicate the recommended solvent on the can. If such information is not available, use the universal P812-60 - it suits 80% of metallics on the market.
2. Dilution proportions: table for different conditions
The optimal dilution proportion depends on the application method (spray gun, brush, spray can) and temperature. Below is the chart for acrylic metallics when using a spray gun with a nozzle 1.3–1.4 mm:
| Temperature, °C | Solvent type | Proportion (paint: thinner: hardener) | Viscosity according to viscometer, sec |
|---|---|---|---|
| 15–20 | Medium (eg. P812-60) | 2 : 1 : 0.5 | 18–20 |
| 20–25 | Slow (eg. P812-30) | 2 : 0.8 : 0.5 | 16–18 |
| 5–15 | Fast (eg. P812-15) | 2 : 1.2 : 0.5 | 22–24 |
| 25–30 | Very slow (eg. P812-10) | 2 : 0.6 : 0.5 | 14–16 |
Important: The viscosity of the paint is checked with a viscometer (for example, DIN-4). If it is not there, you can use a simple test: the paint should flow from the stick in an even stream, and not drip or flow too quickly.
For spray cans the proportions are different: usually metallic is diluted by 10–20% with a solvent (for example, 100 ml of paint + 10–20 ml R-12). When painting with a brush, the paint is diluted more strongly - to the consistency of liquid sour cream.
⚠️ Attention: If you are using hardener, its amount should not exceed 50% of the paint volume. Exceeding will lead to brittleness of the coating and yellowing in 1–2 years.
1. Check the temperature in the garage (optimally 18–22°C)
2. Select a solvent from the table above
3. Measure paint, thinner and hardener in separate containers
4. Mix the ingredients in a clean jar, stirring for 3-5 minutes
5. Check the viscosity with a viscometer or stick -->
3. How to dilute metallic for different application methods
The method of applying paint directly affects the degree of its dilution. Let's look at the three most common methods:
🔧 Spray gun (HVLP) - the most popular way. For metallics use a nozzle 1.3–1.4 mm and pressure 2–2.5 atm. The paint is diluted to viscosity 16–20 sec (according to DIN-4). If the paint is too thick, shagreen will remain on the surface; if liquid - drips.
🖌️ Brush — suitable for local repairs. The paint is diluted more: 0.5–0.7 parts of solvent are added to 1 part of paint. It is important to apply in thin layers to avoid streaking. It is better to use a brush slow solventto prevent the paint from drying too quickly.
🎨 Spray can - convenient for small parts. In this case, the paint is diluted directly in the container by adding 10–15% solvent (for example, Acrylic Thinner). Before use, shake the can for 2-3 minutes so that the metallic pigments are evenly distributed.
For airbrush (used for complex designs) the paint is diluted almost to a liquid state: the proportion can reach 1:1. But this method requires experience - without skills, the metallic will lie unevenly.
If you are painting vertical surfaces (such as doors), make the paint a little thicker than for horizontal ones. This will help avoid drips.
4. Common mistakes when thinning metallics
Even experienced painters sometimes make mistakes that spoil the final result. Here are the most common of them:
❌ Using the wrong solvent - for example, white spirit for acrylic metallic. This results in a dull finish and poor adhesion.
❌ Failure to comply with proportions - too much solvent makes the paint transparent, and too little leads to shagreen.
❌ Poor mixing — if you do not stir the paint with the solvent and hardener for at least 3 minutes, the metallic pigments will settle to the bottom and the coating will be uneven.
❌ Ignoring temperature — in hot weather, paint with a quick solvent dries too quickly, forming microcracks.
Another common mistake is thinning the paint immediately before painting. The paint and hardener must be left for 15–20 minutes (the so-called “induction break”) so that the components are completely mixed.
⚠️ Attention: If you are using cheap solvents unknown brands, test them on a test surface. Some contain impurities that can cause the metallic to yellow after 6-12 months.
To avoid mistakes, always do test spray on an unnecessary part or cardboard. This will help evaluate viscosity, color and gloss before major painting.
5. How to dilute metallic paint for repairs (local painting)
For local repairs (for example, touching up chips or scratches), the paint is diluted differently than for a full paint job. What is important here is to achieve maximum color match and avoid noticeable transitions.
🔹 For small chips (up to 1 cm²) use paint from repair kit (for example, Touch-Up from 3M). It is already diluted to the desired consistency and does not require the addition of solvent.
🔹 For scratches 5–10 cm long dilute the paint in proportion 1:0.3 (paint: solvent) and apply in 2-3 layers with intermediate drying for 10-15 minutes.
🔹 For painting the whole part (eg bumpers) use the standard proportions from the table in section 2, but reduce the amount of hardener by 10-15% so that the paint remains “open” for blending longer.
For local repairs, metallic is applied thin layersto avoid differences in shade. The last coat can be thinned slightly (by adding 5-10% thinner) for a smoother transition.
Critical point: when touching up metallic paint, never use paint from different batches - even from the same manufacturer, shades may differ. Always use paint with the same lot number.
What to do if the metallic has lost its shine after painting?
If the metallic has become dull, the reason may be:
1. Wrong solvent (for example, high white spirit content).
2. Too thick a layer of paint that does not have time to dry.
3. Low temperature when drying (less than +10°C).
To fix, polish the surface with an abrasive paste. 2000–3000 or apply a coat of clear varnish.
6. Advice from professionals: how to achieve the perfect result
Experienced painters share secrets that help achieve the perfect metallic finish:
💡 Use a paint filter - even if you have thoroughly mixed the paint, pass it through a filter 125–190 µm before pouring into the spray gun. This will remove undissolved particles that could clog the nozzle.
💡 Control humidity — at humidity levels above 60%, metallic paint may become cloudy. Use a dehumidifier or reschedule painting for another day.
💡 Apply metallic in 2-3 layers — make the first layer translucent (“fog”), then apply the main layer. This will help avoid streaks and unevenness.
💡 Dry at the right temperature - perfect 20–22°C. At higher temperatures, the paint dries too quickly, which leads to microcracks.
If you're painting your car in the garage, make sure it's free of dust. even small particles falling on fresh metallic will ruin the appearance. Use sticky wipes to capture dust in the air.
To achieve maximum shine, polish the surface after drying (after 24-48 hours). non-abrasive paste (for example, 3M Perfect-It). This will enhance the metallic effect and protect the paint from UV rays.
Ideal metallic painting requires compliance with three conditions: the correct solvent, precise proportions and control of the microclimate in the room.
FAQ: Frequently asked questions about thinning metallic paint
Can metallic be thinned with water?
No, water is not suitable for diluting car enamels. It does not dissolve acrylic or alkyd resins, but only dilutes the paint, which leads to delamination and loss of adhesion. For water-soluble paints (e.g. waterborne) use special water-based thinners, but they are not suitable for traditional metallics.
How to dilute metallic if there is no solvent?
As a last resort you can use acetone or 646th solvent, but this is risky: they are aggressive and can ruin the pigments. It is better to postpone painting and buy a specialized solvent (for example, P812). If you can't wait, test acetone on a small area.
How long does thinned metallic paint last?
After adding hardener, the paint is suitable for use for 4–6 hours (at +20°C). Without a hardener, thinned paint can be stored in an airtight container for up to 2–3 days, but before use it must be mixed thoroughly. If the paint begins to thicken or form clumps, it is better to throw it away.
Why did the metallic become dull after painting?
There are several reasons:
- 🔸 An unsuitable solvent was used (e.g. high alcohol content).
- 🔸 The paint was applied too thickly and did not have time to dry.
- 🔸 Low temperature when drying (less than +15°C).
- 🔸 There is no layer of transparent varnish (metallic without varnish quickly fades).
To restore shine, polish the surface with an abrasive paste (1500–2000) and apply a coat of varnish.
Is it possible to mix metallics from different manufacturers?
Not recommended. Even if the colors appear identical, the pigments and binders may differ, resulting in uneven shine or separation. If you have to mix, do a test on an unwanted part and wait until it dries completely (24 hours) to evaluate the result.