There are several different types of varnish you can choose from to varnish your acrylic painting. If you want to learn more about the different options for varnishing acrylic paintings, read on. If you prefer a quick answer and want to know that I've been using for years that I will wholeheartedly recommend, it's Golden Acrylic Polymer Varnish (glossy). More about that in a minute...
Choosing a varnish for your acrylic painting
First, you will need to choose whether you want to use a brush-on varnish (the most common kind), or a spray varnish. I personally prefer to use a brush-on varnish because I feel it gives me greater control over the outcome, but some people might prefer a spray varnish (this links to Blick Art Materials, and if you make a purchase I get a small commission that helps support this site).
Since I am more familiar with brush-on varnishes, I'll tell you more about those.
Polymer or Resin?
Next, you will need to decide between using an acrylic polymer varnish or an acrylic resin varnish.
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In general, acrylic resin varnishes are glossier, stronger and clearer than acrylic polymer varnishes. Therefore, if you want a high-gloss finish, you should go for an acrylic resin varnish such as Golden MSA Varnish. Before applying the final varnish, you'll need to apply an "isolation coat" over the entire painting.
This is especially important if you plan to use a matte or satin varnish, which may otherwise appear cloudy if an isolation coat is not first applied. The usual recommended mixture for an isolation coat is 2 parts of Golden Soft Gel Gloss mixed with 1 part water. After the isolation coat has thoroughly dried, you can then varnish your painting.
The downside of acrylic resin varnishes is that they are toxic if inhaled, so you will need to apply the varnish in a well-ventilated area. To thin the varnish and to clean your brushes afterwards, you'll need to use mineral spirits.
Acrylic polymer varnishes, on the other hand, are non-toxic. They can be diluted with water and you can wash your brush with regular soap and water when you are finished. If you plan to use a satin or matte varnish, then an isolation coat is also strongly suggested.
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Three brands of acrylic polymer varnish that I would recommend are: Golden Polymer Varnish, Liquitex Acrylic Polymer Varnish, and Lascaux UV Varnish. As you know, Golden is my favorite, but that doesn't mean the other ones aren't just as good. When there are several high-quality brands available, it all boils down to personal preference.
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With that said, I happily use Golden Acrylic Polymer Varnish (glossy) to varnish every single one of my paintings, and I am totally happy with it!
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