We have used this product many times and it was and still is one of the best ways to put a pattern on any paintable surface. Make a mistake and a little bit of water will remove the pattern and allow you to redo the area.
PT - Chalk Cartridge Set
(5055700416) List Price $10.50
Precise Line and Exact Point Markings (5055700416). Used for Labeling, marking, and drawing on a multitude of materials, such as textiles, wood, paper, metal and plastics. The cartridges come in a break-proofed packet, are economical in use and can easily be changed thanks to the patented holder mechanism.
"it was and still is one of the best ways to put a pattern on any paintable surface"