Not been my experience. I have some repairs on my truck over 3 years old with no issues. They are a laquer based paint designed for easy application by novices. Less durable than factory paint but this car isn’t new, its a 2011. What will the whole car look like in 3 years?
There are other suppliers. Some that offer urethane based base-coat and clear coats. They are actually better products that more closely match the paints applied at the factory but they are less novice friendly. But they can supply ANY color code whereas DupliColor is more limited.