The easiest way to determine if acrylic paint has gone bad is to smell it. Expired acrylic paint will tend to have a sour, aged smell that could be the result of excess moisture where the paint was stored. The shelf life of acrylic paint is anywhere from 2 to 5 years if the tube has been opened and upwards of 10+ years if the container is sealed.
What to Do With Old Paint
Some people decide to use old acrylic paint. However, if the acrylic paint has developed a pungent smell similar to spoiled milk, your best bet is to toss the paint and start over.
How to Fix Lumpy Paint
Usually, you can revive the lumpy acrylic paint if you can still get the paint out the tube. Since acrylics are water-based, you can add water and mix it into the paint using a palette knife until you develop a better consistency. Be sure not to mix in too much water, which could compromise the paint coverage and color. Too much water could also cause your paint to lift off the canvas once it’s dried. Also, water becomes ineffective if the acrylic paint is rock hard. In this case, you can try to rework the paint with a clear acrylic base. To prevent the paint from drying in the first place,
How to Revive Separated Acrylic Paint
You can revive separated acrylic paint by mixing the pigment and binder back together with a palette knife. You could also return the paint to the store for a replacement.
How to Prolong Acrylic Paint Dry Time
Try to eliminate any drafts where you’re painting by closing a window or turning off a fan. If you are painting outside on a windy day or hot, consider going inside. Also, keep a spray bottle on hand and gently mist down the canvas and palette every so often to keep things moist longer. Some people also add paint retarder to their paint. However, make sure you don’t use too much or your paint might never dry.
The Paint Has Poor Coverage
There are transparent and opaque acrylic paint colors. If you notice you have inadequate paint coverage, make sure the acrylic paint pigments are labeled as opaque. If you accidentally purchased transparent paint, see if mixing in some titanium white enhances the color’s coverage.
The Paint Dries a Different Color
Some less expensive acrylic paints will dry much darker than when they first go on the canvas. This color discrepancy can make color matching more challenging. You could either upgrade to a better quality paint or become familiar with how much a particular paint brand darkens as it dries. You can compensate by mixing your wet paint colors in a much lighter shade than you desire.
