Want to get the most out of your spray paint? Try using it within a year or two of opening, and always read the label for specific storage and use instructions. You can also experiment with different techniques, like layering or mixing colors, to create unique and amazing effects.
How Bad Is Spray Paint For The Environment at Max Renwick blog
And hey, even if your spray paint does go bad, it's not the end of the world! You can always repurpose the can as a pen holder or desk organizer. The possibilities are endless, and it's all about thinking outside the box (or can, in this case!).