Irwin 65102 Marking Chalk 5 Lb Permanent Red

Product Description

The IRWIN 65102 is a permanent red marking chalk formulated for exterior applications where long-term line visibility is required. Supplied in a 5-pound quantity, this chalk is designed to remain legible after extended exposure to weather, making it a reliable choice for outdoor layout and reference lines. It is commonly used by contractors, framers, masons, and other trade professionals who need a durable chalk line material that holds up on job sites where conditions change rapidly. The permanent formulation sets it apart from standard washable chalks when a lasting mark is the priority.

This chalk is suited for exterior layout work on concrete slabs, roofing, decking, masonry, and rough framing. The red pigment provides strong contrast against light-colored substrates and low-visibility surfaces. It is intended for use with standard chalk line reels and is sold by the unit. Applications where temporary lines are not acceptable — such as reference marks that must survive multiple work sessions or wet conditions — are the primary use case for this product.

Key Features

• Permanent exterior-grade formulation resists weathering over extended periods
• Red pigment delivers high contrast on concrete, wood, and masonry surfaces
• 5-pound fill quantity reduces refill frequency on large layout jobs
• Compatible with standard chalk line reels
• Packaged as a single unit for straightforward inventory and job site use

Compatibility

Designed for use with standard chalk line reels used in construction, framing, roofing, and masonry layout applications.

Installation Notes

Fill the chalk reel to the manufacturer-recommended capacity to avoid overpacking and line drag. When applying permanent chalk, confirm the substrate is the intended final mark location, as removal may require mechanical abrasion. Keep the chalk stored in a sealed container when not in use to prevent moisture absorption and clumping. This product is intended for professional layout use and should be handled in accordance with the manufacturer safety data sheet.

Technical Specifications

• Color: Red
• Formulation Type: Permanent exterior
• Net Weight: 5 pounds
• Package Weight: 5.38 pounds
• UPC: 024721500212

Standard Information

• Brand: IRWIN
• Manufacturer Part Number: 65102