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After painting a new piece, you may wonder how to best protect it from sunlight, dust, and scratches. Varnish creates a protective cover that can also provide a nice shine to make the colors in your painting appear even more vibrant. Depending on your style, there are several different finishes you could choose, from a subdued matte to a high gloss. Because you have to wait for the paint to dry, as well as giving each coat several hours to cure, this project may take you several days to complete.

Part 1
Part 1 of 3:

Choosing a Varnish

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  1. Gloss varnishes are very popular as they provide a strong, clear, shiny protective coating. If you want the colors of your painting to pop even more than they already do, this is a great choice.[1]
    • If you use a gloss varnish and decide after the first coat that you don’t like it, you can easily switch to matte or satin for the second coat.
  2. Matte varnish is a popular choice when you don’t want a shiny finish on your painting. It can make darker colors look lighter and dries with a flat-finish, meaning that there is no sheen.[2]
    • If your painting contains very subtle differences between shades of color, this may not be the best option. The matte varnish could make it harder to distinguish between those subtleties.
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  3. If you like the idea of a little bit of shine but don’t want a high-gloss finish, a satin varnish may give you exactly what you want. It will still soften the colors a little bit, but it will also create a semi-glossy finish.[3]
    • Just like with matte varnish, satin may make some shades of colors harder to distinguish from each other, especially if they were very similar to begin with.
  4. These varnishes contain ultra-violet light stabilizers (UVLS), which help protect your painting from damage or fading due to exposure to sunlight.[4] They can be cleaned up with soap and water, and they’re much easier to remove from a painting if you ever decide you want to make changes to it.[5]
  5. The fumes from solvent-based varnishes are toxic, so you’ll need to have access to a well-ventilated area while working with it. They’re thus named because they need to be thinned with a solvent before being applied, and you’ll need mineral spirits to clean your brushes.[7]
    • These are also often referred to as MSA (mineral spirit acrylic) varnishes.
    • If you do choose a solvent-based varnish, you’ll want to test your painting for a solvency reaction before coating the entire thing.

    Doing a Solvent-Sensitivity Test: Apply the solvent (usually rubbing alcohol, turpentine, or some type of mineral spirits) to a cotton swab and dab it along the edge of the painting. Check the swab to see if any paint came away. If paint came up, use either a spray version of the varnish or switch to a water-based one.

  6. Spray varnishes are great to use on paintings that have uneven surfaces, which can happen due to different styles and methods of painting. It allows you to coat the painting without disturbing the surface with a paintbrush.[8]
    • Make sure to work in a well-ventilated area and spray the varnish away from you onto the canvas if you choose this option.
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Part 2
Part 2 of 3:

Applying an Isolation Coat

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  1. An isolation coat provides a thin barrier between the paint and the varnish. It becomes very important if you ever decide to remove the varnish to modify your painting. It also serves as a sealant for any areas of the canvas that may still be absorbent.[9]
    • Don’t use an isolation coat if your painting contains water-soluble materials, like paper.
    • Don’t use an isolation coat if you used metallic leaf in your painting.
  2. Watermark wikiHow to Put Varnish on Acrylic Painting
    Soft gel is a type of gloss you can purchase at your local craft store. This is a separate product from the varnish. Start with 2 tablespoons (30 mL) of gel and 1 tablespoon (15 mL) of water and add more if you start to run out. Mix the water and gel very gently with a spoon in a small bowl.[10]
    • If you mix the water and gel too vigorously, bubbles might appear. Bubbles will affect the finish of the isolation coat when it dries. Rather than trying to salvage it, start over and stir the mixture more gently.
    • Applying an isolation coat will give your painting a slight sheen, but that will be covered up very easily if you’re using a matte varnish.
    • Some brands sell ready-to-use isolation coats that don’t require any mixing.
  3. Watermark wikiHow to Put Varnish on Acrylic Painting
    Before applying the isolation coat, gently run a wide, dry paintbrush over the surface of the painting. This will remove any hairs, dust, or dirt and keep them from getting caught in the isolation coat.[11]
    • Make sure the brush itself isn’t dusty. It’s best to use a new one or one that has been cleaned and dried thoroughly.
  4. Watermark wikiHow to Put Varnish on Acrylic Painting
    Dip the tip of a wide paintbrush into the soft gel mixture. Start in the middle of the painting and spread the coat out to the edges to cover the entire surface area. Then go back and use long even brush strokes from side to side to smooth out the coating. [12]
    • Go around the edges of the painting and clean up any drippings with the paintbrush.
  5. The painting will be dry to the touch after about 30 minutes, but it’s recommended that you wait an entire day before applying the varnish. Leave it laying flat somewhere it won’t be in the way of pets, children, or other disturbances.[13]
    • It won’t hurt the painting if you leave it for longer than 24 hours before moving on to varnishing.
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Part 3
Part 3 of 3:

Adding Layers of Varnish

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  1. You shouldn’t varnish a painting while it’s propped up on an easel or hanging on a wall, as the varnish will run off the canvas. Lay old newspaper underneath the canvas to catch any drips.[14]
    • If the painting is too big or if you don’t have a table available, you could always set it on the floor. Just make sure it’s somewhere out of the way so it won’t get stepped on.

    Using Spray Varnish: Set the painting vertically for spray varnish. Shake the can well, and then spray the painting evenly from left to right and then right to left, all the way down to the bottom of the canvas. Wait 5-7 minutes between the first coat and second coat and always work in a well-ventilated area.

  2. Depending on what kind of varnish you decided to use, you may need to dilute it with water or a solvent. Pour the varnish into a shallow container so it’s easy to dip your paintbrush into it.[15]
    • Some varnishes don’t need to be mixed with anything else, so check the back of the bottle or container before doing anything.
  3. In most cases, the varnish will either amplify the colors you used by adding a layer of gloss, or they may mute them slightly if you’re using a matte finish. Apply the varnish to a small, inconspicuous part of the painting and let it dry for about 10 minutes to make sure it doesn’t alter your painting in an undesirable way.[16]
    • If the sides of your canvas are painted, you could always test the varnish there so you don’t add any varnish to the actual painting yet.
  4. Watermark wikiHow to Put Varnish on Acrylic Painting
    Dip about 1/3 of the brush into the varnish, then start brushing it onto the canvas from the center of the painting. Spread it evenly from side to side using long, even strokes. Try to follow the same brushstrokes you used when applying the isolation coat.[17]
    • Continue dipping your paintbrush into the varnish as the bristles become dry.
  5. Watermark wikiHow to Put Varnish on Acrylic Painting
    After coating the surface area with varnish, go back and brush long, even strokes either from side to side or from top to bottom. Make sure the layer of varnish is as even as possible.[18]
    • If you notice small bubbles forming in the varnish, use just the tip of your paintbrush to make long strokes from side to side to pop them before the varnish dries.
    • Sometimes tilting the painting from side to side can help you see if there are areas that you missed or that are over-saturated with the varnish.
  6. Varnish dries pretty quickly but will give better results if it has several hours to dry between each application. Apply the second coat the same way you did the first coat.[19]
    • Check the instructions on your varnish to see if there are specific curing guidelines.
    • Most acrylic paintings need just 2 coats of varnish, but if the varnish looks uneven in some sections after it has dried, apply a third coat. Sometimes if each coat is very thin, it may not evenly cover the entire canvas.[20]
  7. The varnish may feel dry to the touch soon after it was applied, but it takes time for it to completely dry and adhere to the paint. Keep the painting somewhere safe from disturbances during the curing process.[21]
    • Place the painting against the wall or on an easel with the painting facing the wall or easel to protect it from getting dust or hairs on it.
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Expert Q&A

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  • Question
    How many coats of varnish should you put on an acrylic painting?
    Jeanine Hattas Wilson
    Jeanine Hattas Wilson
    Professional Painter
    Jeanine Hattas Wilson is a Professional Painter and the President of Hattas Public Murals, Inc. With nearly 20 years of experience, Jeanine specializes in creating, overseeing, designing, and painting murals. Jeanine holds a BA in Advertising from Marquette University and a Studio Painting Minor from The Milwaukee Institute of Art & Design. She has studied at The Atelier Artien in Paris, France, Los Angeles Academy of Figurative Art, and under renowned artists such as Robert Liberace, Michael Siegel, and William Cochran. To date, Hattas Public Murals has painted nearly 5,000 commissioned works of art in homes and commercial and public spaces.
    Jeanine Hattas Wilson
    Professional Painter
    Expert Answer
    Two coats of varnish are usually enough for an acrylic painting. Be sure to apply the varnish in thin coats, and wait for each coat to dry before applying another.
  • Question
    What happens if you shake varnish?
    Jeanine Hattas Wilson
    Jeanine Hattas Wilson
    Professional Painter
    Jeanine Hattas Wilson is a Professional Painter and the President of Hattas Public Murals, Inc. With nearly 20 years of experience, Jeanine specializes in creating, overseeing, designing, and painting murals. Jeanine holds a BA in Advertising from Marquette University and a Studio Painting Minor from The Milwaukee Institute of Art & Design. She has studied at The Atelier Artien in Paris, France, Los Angeles Academy of Figurative Art, and under renowned artists such as Robert Liberace, Michael Siegel, and William Cochran. To date, Hattas Public Murals has painted nearly 5,000 commissioned works of art in homes and commercial and public spaces.
    Jeanine Hattas Wilson
    Professional Painter
    Expert Answer
    You'll create bubbles in the varnish that will harden onto the surface of your acrylic painting. With this in mind, it's never a good idea to shake your varnish.
  • Question
    Does varnish or paint dry faster?
    Jeanine Hattas Wilson
    Jeanine Hattas Wilson
    Professional Painter
    Jeanine Hattas Wilson is a Professional Painter and the President of Hattas Public Murals, Inc. With nearly 20 years of experience, Jeanine specializes in creating, overseeing, designing, and painting murals. Jeanine holds a BA in Advertising from Marquette University and a Studio Painting Minor from The Milwaukee Institute of Art & Design. She has studied at The Atelier Artien in Paris, France, Los Angeles Academy of Figurative Art, and under renowned artists such as Robert Liberace, Michael Siegel, and William Cochran. To date, Hattas Public Murals has painted nearly 5,000 commissioned works of art in homes and commercial and public spaces.
    Jeanine Hattas Wilson
    Professional Painter
    Expert Answer
    Varnish dries a lot faster than acrylic paint. Because of this, you should never apply varnish to a painting that isn't fully dry.
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Tips

  • Place a box over the painting while the varnish dries if you have pets. The box will keep any hair or dander from settling onto the painting.[22]
  • If you’re uncertain of what brand to buy, read reviews on art blogs and customer reviews online to help inform your decision.[23]
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Warnings

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Things You’ll Need

Applying an Isolation Coat

  • Soft-gel gloss
  • Water
  • Spoon
  • Small bowl
  • Dry paintbrush
  • Paper towels

Adding Layers of Varnish

  • Varnish
  • Small bowl
  • Paintbrush
  • Paper towels
  • Newspapers

About This Article

Jeanine Hattas Wilson
Co-authored by:
Professional Painter
This article was co-authored by Jeanine Hattas Wilson. Jeanine Hattas Wilson is a Professional Painter and the President of Hattas Public Murals, Inc. With nearly 20 years of experience, Jeanine specializes in creating, overseeing, designing, and painting murals. Jeanine holds a BA in Advertising from Marquette University and a Studio Painting Minor from The Milwaukee Institute of Art & Design. She has studied at The Atelier Artien in Paris, France, Los Angeles Academy of Figurative Art, and under renowned artists such as Robert Liberace, Michael Siegel, and William Cochran. To date, Hattas Public Murals has painted nearly 5,000 commissioned works of art in homes and commercial and public spaces. This article has been viewed 63,295 times.
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Co-authors: 3
Updated: October 28, 2024
Views: 63,295
Categories: Acrylic Painting
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