Is there any other way to paint the hand board besides painting it?

Some solvents can be used to treat the surface of foam balls. Will it flow down one by one immediately after hanging up? Be careful, such as weak acid or organic solvent (acetone), which can be applied together with oily color paste. If you want to color, it will form a slippery film. That's because its surface has been oxidized Does the color of the foam ball hang up and flow down immediately? That's because its surface has been oxidized into a very slippery film. If you want to color, there is still a way. The surface can be treated with some solvents, such as weak acid or organic solvent (acetone). Use with caution, or change the color paste. Be sure to use water-based color paste and replace it with oily color paste.