Isabella Flores
Acrylic paintings are susceptible to dust, dirt, and UV rays, which can ruin the artwork over time. While it is not necessary to seal an acrylic painting, as the paint is permanent once dry, adding a sealant can protect the artwork and enhance its appearance. The type of sealant used will depend on the surface the acrylic is painted on, with different options available for canvas, wood, glass, fabric, metal, and ceramic. Varnishes, for example, can be used to add a protective coat, but it is important to consider the potential challenges of using varnishes, such as yellowing or the need for solvents that may damage the paint layer. Sealants can also affect the finish of the painting, with options ranging from glossy to matte, each offering unique aesthetic qualities.
| Characteristics | Values |
|---|---|
| Purpose of sealing an acrylic painting | To protect the painting from dust, dirt, UV rays, scratches, and everyday wear and tear. |
| Benefits of sealing | Enhances and preserves the colours, provides a finished look, and makes the painting last longer. |
| Sealant options | Acrylic resin varnish, acrylic polymer varnish, clear sealer, Mod Podge, polycrylic sealer, or an isolation coat followed by a removable varnish. |
| Surface considerations | The choice of sealant depends on the surface: canvas, wood, glass, metal, or ceramic. |
| Application methods | Brush-on, spray-on, or high gloss. |
| Precautions | Test the varnish on a different surface, ensure the painting is dry, apply multiple thin coats, work in a well-lit area, and wear protective gloves. |
| Drawbacks | Potential for cloudiness, yellowing, or damage during removal. |
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What You'll Learn
Varnishing an acrylic painting
While it is not necessary to seal an acrylic painting, as acrylic paint is permanent once dry, sealing your painting will provide protection and preservation from environmental factors such as UV rays, dust, scratches, and everyday wear and tear. Sealing will also enhance the vibrancy of the colours in your painting.
There are a variety of varnishes to choose from, including gloss, satin, and matte. Each will bring a different look to your painting, so it is worth experimenting to find your preferred finish. For example, a matte varnish will bring out the texture of the underlying paint, but it will dull metallics and bright colours. A gloss varnish will add shine and vibrancy to the colours.
Before you varnish, it is recommended that you apply an isolation coat, which will act as a barrier between your painting and the varnish. This will protect your painting from the chemicals used to remove the varnish in the future. To apply an isolation coat, use an acrylic gel medium or gel gloss diluted with water. For example, Golden Soft Gel Gloss recommends mixing 2 parts gel gloss to 1 part water.
When you are ready to varnish, ensure that you are working in a bright, well-lit area. Use a brush specifically kept for varnishing and, if using a water-based varnish, mix the varnish with water as instructed on the bottle. Apply multiple thin coats, rather than one thick coat, and do not over-brush, as this may cause a cloudy finish. Allow the varnish to dry for 24 hours or more.
If you wish to add extra protection, you can use a spray varnish, such as Winsor & Newton Artists' Gloss Picture Varnish, after applying your isolation coat. Spray in one direction, holding the can 5-7 inches away from the painting, and then repeat in the opposite direction to ensure full coverage.
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Types of sealants
Sealing an acrylic painting is an important step to protect and preserve your artwork from UV rays, scratches, dust, and general wear and tear. The best sealant to use depends on the type of surface the acrylic is on.
Acrylic Polymer Varnish
This varnish is commonly used to seal acrylic paintings on canvas. It comes in different sheen options like resin varnishes and polymer varnishes. Polymer varnish is also non-toxic, so you don't have to worry about ventilation in your workspace.
Polycrylic Sealer
Polycrylic is a good sealant option for wood surfaces. It comes in matte, satin, semi-gloss, and
Mod Podge
Mod Podge is a popular and inexpensive sealant option for glass, metal, and ceramic surfaces. It is non-toxic, non-flammable, and can be easily cleaned up with soap and water. It also comes in brush-on and spray-on application options and has a variety of finish options.
Clear Coat Acrylic Sealant
Clear Coat is similar to a clear sealer for wood but can be used on a variety of surfaces. It protects artwork from smudges and moisture and does not add a yellow tint.
Matte Varnish
Matte varnish is a good option for those who want to seal their artwork without a shiny finish. This type of varnish is known to soften the colours of the painting.
Glossy Varnish
Glossy varnish will bring out the pigments in your work, making the colours more vibrant. However, it can cause reflections in photographs, so it is recommended to take pictures of your painting before sealing it.
Satin Varnish
Satin varnish is a middle ground between matte and glossy finishes. It typically creates less glare than a glossy varnish while lightening dark colours and softening pigments.
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Preparing the painting for sealing
Preparing an acrylic painting for sealing involves several steps to ensure the preservation of the artwork. Firstly, it is crucial to allow the acrylic painting to dry completely before applying any varnish or sealant. The drying time can vary, but it is generally recommended to wait for at least 24 hours, or even up to 72 hours, to ensure that the paint is thoroughly cured. This precaution prevents any thick undercoats from mixing with the sealer and ruining the final finish.
Once the painting is dry, it is advisable to take photographs of the artwork. The reason for this is that the sheen of a varnished painting can create glare, making it challenging to photograph. Taking pictures beforehand ensures you can capture the true colours and details of your painting. Additionally, signing your artwork is recommended, and this should be done before applying any varnish.
Before proceeding with sealing, it is essential to select the appropriate sealant or varnish. The choice depends on the surface you are sealing. For instance, if you are sealing an acrylic painting on canvas, an acrylic polymer varnish is commonly used. On the other hand, for wood surfaces, a polycrylic sealer is recommended. Glass, metal, or ceramic surfaces may use sealers like Mod Podge. It is also crucial to choose a sealer that is water-based and specifically designed for acrylic paints, not oil paints.
To prepare your workspace, lay down protective covering, such as old newspapers, to safeguard the surrounding surfaces. Ensure your varnish or sealer is at the same temperature as your painting by keeping them in the same room for over 24 hours. This step helps prevent any unexpected chemical reactions. Additionally, make sure to wear protective gloves, as some sealers can be challenging to remove from the skin once dried.
Finally, before applying the sealer, wipe your artwork with a lint-free towel to remove any dust or hairs. This step ensures that dust and dirt do not become embedded in the varnish, which could affect the final appearance. Following these steps will help ensure your acrylic painting is adequately prepared for sealing, preserving its beauty and vibrancy for years to come.
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Applying the sealant
Firstly, take pictures of your painting before you seal it, as a glossy finish can cause reflections in photographs. Sign your name before you varnish, on top of the coat of acrylic paint.
The best sealant to use will depend on the type of surface the acrylic is on. For example, to seal an acrylic painting on canvas, many artists use an acrylic polymer varnish. If you are sealing paint on a wooden surface, a polycrylic sealer is a good choice. For glass, metal, or ceramic, Mod Podge is a popular and inexpensive option. You can also use a spray sealer, like Polycrylic, which dries quickly and fully cures after about two weeks.
When applying the varnish, use multiple thin layers or light coats, instead of fewer thicker coats. Don't over-brush, as this can cause a cloudy finish. Don't go back over areas that are drying, as this can also cause cloudiness. Work in a bright, well-lit area so you can see where the varnish has already been applied.
If you are using a brush-on varnish, use a big paintbrush and cover the entire surface, checking in the light to see that you've covered everything. You can also imitate the brush strokes in your painting to add texture and keep the feel of the brushstrokes in this outer layer.
Make sure to leave the painting to dry for 72 hours to 2 weeks before varnishing. The drying time will depend on how thick the acrylic layers are. If the painting is still wet while varnishing, moisture could get trapped, affecting the finish.
You can also apply an isolation coat if you are happy with how this layer impacts the colour and finish. This coat goes on top of the finished painting to isolate it from the topcoat of varnish. That way, when you remove the topcoat of varnish, along with its accumulated grime, you are less likely to remove any paint.
Finally, wear protective gloves, as some sealers are hard to remove from the skin once dried.
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Benefits of sealing
Sealing an acrylic painting can offer several benefits and is a good idea, especially if you plan to sell or gift your artwork. Firstly, a sealant adds a protective layer to your painting, shielding it from dust, dirt, debris, and UV rays. This protective barrier helps preserve the beauty of your artwork, keeping it vibrant and fresh-looking for longer. It also ensures that your painting withstands the test of time by protecting it from scratches, dings, and everyday wear and tear.
Sealing your acrylic painting can also enhance its overall aesthetic appeal. You can choose from various sealant finishes, such as glossy, satin, or matte, to achieve your desired look. A coat of varnish can give your painting a professional appearance that will last, making it ideal if you plan to display or sell your work.
Additionally, sealants can provide a removable surface for your painting. Over time, this surface may collect dust, smoke, and dirt, dulling the painting's appearance. However, you can remove this layer of varnish, effectively restoring your painting to its original state.
The type of sealant you choose will depend on the surface you are painting on. For instance, if you're painting on canvas, acrylic polymer varnish or acrylic resin varnish is recommended. On the other hand, if you're working on a wooden surface, a polycrylic sealer or a wax-based sealant is a better option.
It's important to note that while sealing has its benefits, it also comes with some considerations. For example, traditional natural varnishes like dammar can yellow over time, and the solvents used for their removal may damage the acrylic paint layer. Therefore, it's crucial to select the appropriate sealant for your artwork and test it on a small area before proceeding.
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Frequently asked questions
Sealing an acrylic painting is not necessary, but it is recommended if you want to protect it from dust, dirt, scratches, UV light, and surface damage. It can also give your painting a fresh and professional look.
The best sealant depends on the type of surface the acrylic is on. For canvas, an acrylic polymer varnish is recommended. For wood, a polycrylic sealer or wax-based sealant works well. For glass, metal, or ceramic, Mod Podge is a popular and inexpensive option.
Varnishes come in matte, satin, and glossy finishes. Matte varnish will not make your painting shiny, but it may soften the colours. Glossy varnish will bring out the pigments and make colours more vibrant. Satin varnish is a good middle ground, lightening dark colours and softening pigments without creating as much glare as glossy varnish.
First, make sure your painting is completely dry. Then, test the varnish on a small area of the painting to ensure you like the results. You can apply varnish with a brush or a spray. When using a brush, work in the same direction and use light coats to avoid a cloudy finish. With a spray, hold the can about 12 inches away from the painting and spray evenly.
Before varnishing, it is recommended to apply an isolation coat to create a barrier between the painting and the varnish. This allows you to remove and reapply the varnish in the future. You should also sign your name on the painting before varnishing. Additionally, take photographs of your painting, as varnished paintings can be tricky to photograph due to glare.
