Why Do Paint Cans Have a Groove Around the Rim? #video

Ever wondered why paint cans have that little groove around the rim? It's more than just a design quirk. In this video, we break down the fascinating function behind that groove — from sealing and preventing leaks to helping with stacking, pouring, and preserving your paint for future use.
Discover how this small design detail plays a big role in storage, transportation, and usability — and why it hasn't changed much in decades.