Elena Rossi
There are various reasons why you might want to thicken paint. For instance, you may need thicker paint to cover a darker colour on a wall or to create a more textured effect. There are many ways to thicken paint, including adding thickening agents such as cornstarch, flour, or hydroxyethyl cellulose. You can also use commercial gels and pastes, or household products such as baking soda.
| Characteristics | Values |
|---|---|
| Thickening agents | Corn starch, flour, marble dust, chalk dust, baking soda, beeswax, hydroxyethyl cellulose, gel mediums, modeling paste, acrylic mediums, joint compound, spackle, diatomaceous earth, stand oil, alkyd gel medium, alkyd butter, cold wax medium |
| Use cases | Acrylic paint, latex paint, oil paint |
| Advantages | Creating texture, enhancing adhesion, slowing drying time, adding gloss |
| Disadvantages | May damage the lastingness of the paint, may cause discoloration over time, may cause cracking and peeling |
| Tips | Add a small amount of the thickening agent at a time, stir slowly, test the paint on a small area, adjust the amount of medium until the desired consistency is reached |
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What You'll Learn
Corn starch
To use corn starch as a paint thickener, first mix it with water. The ratio is typically 1 ½ cups of cold water to 2 tablespoons of corn starch. Place this mixture on a stove over low heat and stir continuously until it becomes a paste. Allow the mixture to cool before adding it to your paint. Add small amounts of the corn starch and water mixture to your paint at a time, stirring thoroughly after each addition. You can continue adding the mixture until you reach your desired thickness.
While corn starch is an affordable and accessible option for thickening paint, there are some disadvantages. Corn starch may affect the longevity of the paint, and there is a risk of mildew forming over the surface of your paintings. It may also cause a colour shift and make your painting less archival. Additionally, the paint may become crumbly and require extra care to avoid knocking it.
If you are concerned about these potential issues, you can explore other options for thickening paint. Commercial paint thickeners are available at department stores and home improvement centres. Art stores also carry brand-name paint additives designed to be mixed with acrylic paints, such as Liquitex and Golden. These additives can help you achieve the desired thickness without compromising the longevity or appearance of your paint.
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Commercial gels and pastes
There are a variety of commercial gels and pastes available that can be mixed with acrylic paint to thicken it. These include gel mediums, modelling paste, and texture gel.
Gel mediums come in a variety of viscosities and finishes, including glossy, semi-glossy, and matte. To thicken paint, choose a gel medium with a higher viscosity than your paint. Gel mediums dry translucently, so they won't affect the colour of your paint.
Modelling paste will give your paint a thicker, more sculptural feel. It can be used to create texture, which can then be painted over.
Texture gel will also thicken paint and add a sculptural feel.
When using commercial gels and pastes, it is important to follow the manufacturer's instructions. Start by adding a small amount of the product to your paint and gradually increase the amount until you achieve the desired consistency.
Some popular brands that offer acrylic paint thickeners include Angelus, Liquitex, Blick, Utrecht, Michaels, Golden, and Daniel Smith.
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Modelling paste
There are several techniques for using modelling paste in painting. One common technique is to mix it with acrylic paint to create a thick paint that can be applied to a surface. Another technique is to lay down the paste and then paint into it while it's still wet. It is also possible to wait for the paste to dry and then brush paint over the top. Regular acrylics work great, and metallic colours can also look beautiful.
It's important to note that modelling paste can take days to dry, so it's recommended to wait anywhere from three to five days before applying a second layer of paste or paint. If you don't let the modelling paste dry completely before painting over it, the paint will seal the paste in and it won't dry properly, which can cause cracking later.
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Household products
Another option is to use modelling paste, which can be painted over. However, this may lighten colours.
Other household products that can be used include baby powder and talcum powder.
For a textured effect, sand, coffee grounds, or marble dust can be added to the paint.
It is important to note that using household products to thicken paint may affect the durability of the paint, cause discolouration, or result in a grainy texture.
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Thickeners from art/home improvement stores
Art and home improvement stores offer a range of products that can be used to thicken paint. These include commercial gels and pastes, which are considered the best option for achieving smooth, thick paint. Acrylic gel mediums are available in gloss, semi-gloss, and matte varieties and can be mixed with acrylic paint to create different textures and finishes. They are designed to thicken paint without compromising longevity, colour, or texture quality. Popular manufacturers of gel mediums include Liquitex and Golden.
Modelling or moulding paste can also be used to thicken paint and create a more sculptural feel. These pastes are typically white and less flexible than gel mediums. While they may not be suitable for creating archival works, they can be effective for short-term use.
In addition to commercial products, some household items can be used as paint thickeners. Corn starch, for example, can be mixed with water and added to paint, providing thickening properties. However, using household products may affect the longevity and workability of the paint.
For latex paint, hydroxyethyl cellulose is a compatible thickening agent that can be purchased from home improvement stores. It can be mixed with water to create a slurry, which is then added to the paint. Drywall joint compound can also be added to latex paint to achieve the desired thickness.
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Frequently asked questions
Some household items that can be added to paint to thicken it include cornstarch, flour, salt, sugar, sand, sawdust, and baking soda. However, it is important to note that adding household items may damage the longevity of the paint or cause discoloration over time.
Yes, there are commercial gels, pastes, and mediums designed specifically for thickening paint. These products are available in different viscosities and finishes, such as glossy, semi-glossy, and matte. Some specific products include Liquitex Gel Medium and Golden Acrylics.
To use a thickening agent, start by adding a small amount of the agent to the paint and stir slowly. Test the paint by applying it to a small area and let it dry completely. If the paint is still not thick enough, add more of the thickening agent in small amounts until the desired thickness is achieved.
Yes, another way to thicken paint is to use more color and add less water. This is especially applicable to water-based paints like watercolors and acrylics. Additionally, for oil-based paints, you can use stand oil instead of turpentine to mix your paints, which will thicken the paint and slow the drying time.
