Foam brushes are a staple in the leather shop for applying paint or dye to a project. 

These 1" wood handle foam brushes work well when applying dye to large areas. They will pick up a lot of dye so I make sure to dab out some of the dye before using. 

In this video I show how I like to use these foam brushes. (Use Time Stamps if you want to just to the brush itself)