 What is the shelf life of art resin? Like most art materials, art resin has a shelf life. In this case, the shelf life refers to the clarity of the product, how long you can expect art resin to stay looking just as clear as it was the day you bought it. So in this case, it is 12 months unopened and about 6 months opened. And the reason for that differential is oxidization. When oxygen hits the hardener in particular, it does have a yellowing effect to some degree. And even if you were to go beyond the shelf life, the product would still cure as expected. It just wouldn't necessarily be as fresh as it was the day you bought it. And even when it's cured, you can still expect it to stay lovely and clear for the long term. Art resin is chemically engineered to protect your art from the yellowing effects of UV light as well. We got you covered.