Irwin 4935524 Marking Chalk Indigo Blue, 4 Lb

Stains surfaces; visible after weeks of weather exposure and jobsite wear. Reduces need for spray sealant. The flip-top cap seals the chalk in an airtight chamber, keeping out moisture and reducing the risk of clumping.

Highlights:

• Exterior
• Permanent
• 4 Pound Refill

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