Translucent Chalkboard Paint
Chalkboard paint has many uses, and is available in many different colours. It covers most surfaces well and is ideal as a base for chalk drawing and writing. Although traditionally used on board to create a chalkboard, you can easily use it on other things, e.g. as wall paint or to cover furniture.
This translucent version allows to make a waterproof wipe able surface on over any paint.