Stains surfaces. For exterior use in extreme conditions. Visible after weeks of weather exposure and jobsite wear. Reduces need for spray sealant. No. 4935518: Size: 6 oz, Permanence Scale (0-4): 4, Chalk Color: Indigo Blue, Pkg Qty: 1, Package Type: Bottle No. 4935524: Size: 4 lb, Permanence Scale (0-4): 4, Chalk Color: Indigo Blue, Pkg Qty: 1, Package Type: Bottle No. 4935519: Size: 6 oz, Permanence Scale (0-4): 4, Chalk Color: Crimson Red, Pkg Qty: 1, Package Type: Bottle

Irwin STRAIT-LINE Permanent Staining Chalk Line Chalk:

Great for extreme outdoor conditions because it can withstand harsh weather conditions and months of jobsite wear.
Flip-cap keeps the chalk in the bottle where you want it and stops it from spilling out in areas that you don't.
Flip-top cap also seals the chalk in an airtight chamber, keeping out moisture and reducing the risk of clumping.