What Type Of Varnish Should I Use To Seal Acrylics On Canvas

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 Waterborne 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 (affiliate link).

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.

I would recommend Golden Waterborne Varnish. It's made by a super-reliable brand and comes with Ultraviolet Light Stabilizers (UVLS) to slow color fading. And if the need ever arises, this varnish is also removable.