Liquid chalk markers are easy to clean off of non-porous surfaces. But, if you want your artwork to stay on the surface permanently, all you have to do is use a porous material to draw on. This will ensure that the markers will be permanent rather than erasable.
Some of these porous surfaces are:
- Traditional chalkboards
- Cardboard
- Paper
- Untreated wood
- Sidewalks
- Concrete
- Most painted walls
- Fabrics and clothing
- Corks
- Carpets and rugs