ProChalk Semi-Permanent chalk for weather- and water-resistant lines that hit and stick for a long time but will eventually wear away naturally. Exterior applications include concrete layout, roofing, metal fabrication.
| PERMANENCY | STANDARD | HI VISIBILITY | SEMI-PERMANENT | PERMANENT | UNLIMITED DYE |
| COLOURS | Blue White | Lime Orange Yellow | Black Red | Back Blue Red | Bue Red |
| PERMANENCE RANK | 1 | 2 | 3 | 4 | 5 |
| BEST FOR | Interior Exterior | Exterior | Exterior | Exterior | Exterior |
| APPLICATIONS INCLUDE | Interior Layout Roofing Siding Paneling | Corrections Pumbing Electrical Roofing Masonry | Exterior Layout Concrete Layout Roofing Metal Fabrication | Exterior Layout Concrete Layout Roofing Long-Term Application | Exterior Layout Concrete Layout Roofing Long-Term Application |