I’m sure everyone has used one of these cans with plastic snap caps. They are a pain in the cartouche to open requiring a screw driver almost every time. Soon the pry tab breaks off and it’s a bear to get the can open.
Push a drywall nail through the cap to make a tiny hole. When you need some thinner or solvent just pick up the can and squirt out what you need.
You can use the nail as a plug, if you like, but I found the hole is small enough to prevent noticeable evaporation even over extended periods.