How to Make an old paint can easier to open

In this video it is demonstrated that how to easily open an old paint can. It is harder to open lid of old paint can because when you open and close lid there is some paint which remains at the top of can and it act as a glue and the lid sticks on it. You can get rid of it by using old grocery bag or two layer of plastic. Just cover the top of the can with this plastic and close it with the lid and now with the help of wood block and hammer, make the lid tight. Using this process you can easily open lid of old paint after a long time.