Choosing the right diluent is a critical step in working with water-based paints, which directly affects the quality of the finishing coating. Many novice masters mistakenly believe that any aggressive chemistry is suitable for acrylic, but this misconception can lead to complete deterioration of the material and the inability to correct the result. Understanding the chemical composition of the emulsion allows you to choose exactly the liquid that will provide ideal viscosity without losing adhesive properties.
The basis of modern acrylic paints is water, but after drying, they form a durable polymer film that is resistant to external influences. That's why. solvent Before drying and cleaning tool dried tool - these are often different things in terms of efficiency. In the liquid state, the material requires a delicate approach so as not to disturb the balance of components, and in the solidified form - a powerful chemical effect.
In this article, we will discuss in detail what types of solvents exist, how they interact with polymers and in which cases their use is justified. You will learn about the technical nuances of breeding, safety rules and get answers to questions that often arise from professionals and amateurs when working with acrylic compounds.
Chemical composition and principle of operation of solvents
Acrylic paints are a complex emulsion where pigments and fillers are dispersed in an aqueous environment with the addition of acrylic polymers. Until the water has evaporated, the polymer particles are suspended, which allows you to easily change the viscosity of the composition. Solvent in this context performs the function of reducing surface tension and dilution of the binder.
After application to the surface, the polymerization process begins: water evaporates, and the polymer chains are crosslinked, forming a monolithic structure. At this stage, the usual water diluent is already powerless. To influence the formed layer, organic compounds are required that can break down or soften polymer bonds.
- 💧 Water. - universal diluent for fresh paints, not changing the color and properties of the coating.
- 🧪 Alcohols. (isopropyl, ethyl) - used for partial dissolution and purification, but can cause clouding.
- 🔥 Ketones and esters - aggressive substances used to remove old spots or washing.
It is important to understand that the use of aggressive chemistry at the stage of applying the paint will lead to coagulation (curtailment) of acrylic. Therefore, the choice of funds depends solely on what stage the material is: in the bank or already on the wall.
Water as the main diluent: rules of use
The most affordable and safe answer to the question "which solvent for acrylic paints is better" is plain water. However, there are also nuances, the neglect of which can spoil the work. The water should be clean, free of mechanical impurities, salts and chlorine, which is often present in the water supply system.
The ideal option is considered distilled or deionized water. The use of hard tap water can lead to a change in the shade of the paint (especially light colors) and a decrease in the service life of the coating due to the deposition of mineral salts in the polymer matrix.
If there is no distilled water at hand, let tap water settle in an open container for 24 hours to chlorine escapes and heavy impurities settle.
The process of water dilution requires gradualism. Do not pour the entire volume of liquid at once. Add water in small portions, thoroughly stirring the composition. The consistency should resemble thick cream or liquid sour cream, depending on the method of application (hand, roller or spray gun).
⚠️ Warning: Excessing water of more than 10-15% of the paint volume can lead to loss of cover and reduced film strength. Acrylic polymer will cease to form a solid coating.
To work with a spray gun requires a more fluid consistency than for a brush. In this case, the water can be slightly heated to room temperature (about 20-22 ° C), which will improve its mixability with the base. Cold water can slow drying and worsen spreading.
Specialized acrylic solvents and diluents
When the water can not cope or you need to change the technical characteristics of the paint (drying time, gloss, fluidity), specialized chemical compositions come into play. They are manufactured by paint manufacturers specifically for compatibility with their products.
Such solvents often contain a mixture of water, glycols, alcohols, and small amounts of ammonia or amines. These additives prevent too fast drying of paint in the spray nozzle and improve the spread over the surface. Professional diluents They may also contain additives that increase the elasticity of the dried layer.
There are several types of specialized liquids:
- 🎨 For artworks - retain the brightness of the pigment and the texture of the smear.
- 🏗️ Building diluents - are focused on large volumes and drying speed.
- 🚗 Automotive acrylic solvents - contain components for increased strength and chemical resistance.
The use of branded solvents is especially important when coloring. If you add a color to the base, changing the chemical composition of the environment can affect color reproduction. Only specialized diluents ensure that the manufacturer’s declared color will remain unchanged after drying.
How to remove dried acrylic paint
The situation when the paint dried on the tool, clothing or surface, requires a completely different approach. The water is powerless here, as the polymerization has already been completed. To remove the frozen acrylic, powerful organic solvents or special washes are necessary.
The most effective substances for this purpose are acetone, white-spirit, kerosene specialized washing. Acetone acts the fastest by instantly softening the polymer, but it can also damage the plastic parts of the tool or the underlying coating if the surface is cleaned.
Sequence of removal of dried paint:1. Mechanically remove large growths with a spatula.
2. Apply the solvent to a rag or brush.
3. Wait 5-10 minutes for softening.
4. Wipe the softened mass with a hard brush.
5. Wash the surface with soap and water.
For delicate surfaces, such as plastic or lacquered wood, aggressive solvents like acetone cannot be used - they will dissolve the very base. In such cases, it is better to use special gel washes that act locally and do not spread.
Solvent comparative table
To systematize the information and help you choose the best remedy, consider the main characteristics of popular liquids in the comparative table.
| Type of solvent | Efficiency (fresh paint) | Efficiency (dried) | Safety for plastics | Smell. |
|---|---|---|---|---|
| Water (distilled) | Tall. | Absent. | Safe. | Absent. |
| Special acrylic diluent | Very high. | Low. | Safe. | Weak. |
| Isopropyl alcohol | Medium | Medium | Conditionally safe. | Sharp. |
| Acetone/Liquid for removing lacquer | Tall. | Very high. | Dangerous (melting) | Very sharp. |
| White Spirit | Low. | Tall. | Dangerous. | Strong. |
From the table it is clear that there is no universal remedy. Water and special diluents are best suited for working in the painting process, whereas more aggressive chemistry is more effective for cleaning the tool after work.
The main rule: never use aggressive solvents (acetone, solvent) to dilute the paint in the can - this will irrevocably spoil the material.
Safety and storage conditions
Working with any chemical, even water and acrylic, requires compliance with certain rules. Although acrylic paints are considered environmentally friendly, aerosol particles when working with a spray gun can irritate the airways. Therefore, the room should be well ventilated.
Organic solvents used for cleaning are often flammable and toxic. Their vapors are heavier than air and can accumulate in the lower part of the room, creating an explosive concentration. Smoking or using open flames near open solvent cans is strictly prohibited.
⚠️ Warning: Store solvents and paints in tightly closed containers, away from heaters and direct sunlight. The storage temperature should not fall below +5°C so that the emulsion does not dissect.
If paint hits the skin, it is enough to wash the area with warm water and soap. If a strong solvent was used, the skin must be thoroughly washed and lubricated with a moisturizer, since the chemistry strongly dries the epidermis. If you get into the eyes, immediately rinse them with plenty of water and see a doctor.
FAQ: Frequently Asked Questions
Can I dilute acrylic paint with olive oil?
No, olifa is an oil processing product intended for oil paints. Mixing acrylic (water base) and oliphs (oil base) will lead to the stratification of the mixture, the formation of lumps and the inability to obtain a uniform coating.
How to replace a special solvent for acrylic?
The best and safest alternative is clean water. If a longer drying time is required, you can add a little glycerol (literally a few drops per jar), but this can change the surface's shine. Specialized alcohol solvents are not recommended to be replaced.
How long does the acrylic paint with solvent dry?
The drying time "on the stick" is from 30 minutes to 2 hours, depending on the humidity and temperature. Full polymerization and strength gain take from 24 hours to several days. Adding water speeds up drying, and special moderators increase the time.
Can I mix the acrylic paints from different manufacturers?
Theoretically, it is possible if both paints are water-based. However, chemical additives from different brands may differ, which will lead to unpredictable results (color change, detachment). It is better to do the test on a small site before the main job.
Secrets of the professionals
Adding 5% PVA glue to acrylic paint increases its adhesion to smooth surfaces such as glass or plastic.