Roller Pan Liners
Getting the paint rollers clean after use can be such a pain, which is the reason most people use disposable plastic liners. But that can be expensive as well as a waste of plastic.

Roller Pan Liners
Instead just use some foil as your pan next time and you will save both time and money in the long run!
Prevent Paint Skinning
Those who do their own DIY projects will probably be familiar with the notion of skinning paint. It is basically what happens when a can of paint has been left open (even just a little bit!) for a few days. The paint solidifies making it impossible to use for your next job.

Prevent Paint Skinning
To avoid this just put some foil in the can, and blow some air into it as you are closing the paint can lid. The carbon dioxide you blow onto it helps prevent oxidation.