Most professionals paint from a pail rather than a can. Painting out of a can is messy, causing rim buildup and dripping. Here's an easy way to turn an empty paint can into a pail. Use the blade of a five-in-one putty knife to remove the can's rim in one piece, and use the sides of the pail to remove excess paint from the brush.
For more on painting tools, consider:
Selecting the Right Painting Tools
9 Creative Uses for Old Paint Cans
Quick Tip: Avoiding Paint Spills and Spatters