The white glass pencil is, combined with the printables + chalk or waterproof marker, is suitable for:
- Windows with too thick double glass
- Windows that can't open
- Non-transparent surfaces
Find instructies here.
Use the color you're going trace with chalk marker with, so white + light colors: the white pencil and black + dark colors: the black pencil. This pencil works best on non-porous surfaces* and has the same thickness as normal pencils, so you can use your own sharpener.
brand Stabilo | type 8052
suitable for glass, plastic and metal
If you buy a pencil with a window drawing design, you will receive the pencil in the mail and the printable via email. The window drawing designs are not physical products, but something you print it at home.
* Not ideal on chalkboard(paint) because that's too porous and you won't be able to completely remove it.