IRWIN STRAIT-LINE Permanent Staining Chalk is great for extreme outdoor conditions because it can withstand harsh weather conditions and months of jobsite wear. Chalk containers are filled by weight not volume.
Irwin Strait-Line 5x Permanent Indigo Blue Chalk
- 6-oz Chalk Line Refill
Indigo Blue Permanent Staining Marking Chalk
For Exterior use
Visible after weeks of weather exposure and jobsite wear
Stains Surface and Reduces need for spray sealant