Mark layout lines that stay put with IRWIN Strait-Line marking chalk refill. Count on exterior-permanent performance that stays readable for weeks through weather and jobsite traffic. Load up with the 2 lb bottle in high-contrast crimson red to keep crews moving and reduce rework.

Key Features

• Exterior permanent formula: Keep lines visible for weeks in sun, rain, and foot traffic.
• Crimson red color: Get bold contrast on concrete, OSB, masonry, and asphalt.
• Fewer topcoats: Cut down on spray sealant thanks to long-lasting marks.
• Flip-top, airtight cap: Block moisture, prevent clumping, and pour cleanly into your reel.
• High-volume refill: Cover large layouts with the 2 lb bottle and reduce mid-job stops.
• Staining performance: Lay down marks that bond to rough, porous surfaces.

Applications

Snap straight, durable lines for footing and formwork layout, framing, roofing, and hardscape jobs. Use it when you need lines to last outdoors without constant touch-ups. Because this formula stains, avoid finished or delicate surfaces and test in an inconspicuous spot first.

Specifications

• Brand: IRWIN Strait-Line
• Type: Exterior-permanent marking chalk refill
• Color: Crimson red
• Weight: 2 lb
• Cap: Flip-top, airtight

Seal the cap tightly after each use and store in a dry spot to maintain smooth flow and crisp snaps.