Irwin 4935522 Crimson Red Permanent Chalk 2 Lb

Product Description

The IRWIN INDUSTRIAL TOOL CO 4935522 is a 2-pound fill of crimson red permanent staining marking chalk, sold under the Strait-Line product line. This powder chalk is formulated to produce weatherproof lines that resist fading through months of outdoor exposure, including direct sun. Unlike standard chalk, it stains porous and semi-porous surfaces, reducing or eliminating the need to spray a sealant over snapped lines to preserve them. It is used by carpenters, masons, concrete flatwork crews, roofers, and general contractors who need layout lines that stay visible through extended job site conditions.

This chalk is suited for outdoor and indoor layout work where line longevity is critical. Typical applications include concrete slab layout, roofing shingle alignment, framing layout on rough lumber, and masonry coursing. The permanent staining formula is especially useful on job sites where lines must remain legible over multiple workdays or through weather events. Because the chalk stains surfaces, it is not recommended for applications where clean removal is required after the job is complete.

Key Features

• Permanent staining formula bonds to porous surfaces for long-lasting line visibility
• Weatherproof lines withstand months of outdoor exposure and direct sun
• Reduces the need for sealant application over snapped chalk lines
• Crimson red color provides high contrast on concrete, wood, and masonry substrates
• 2-pound fill weight extends refill intervals on high-volume layout work
• Compatible with standard chalk reel chalk ports accepting powder-fill chalk

Compatibility

Designed for use with standard chalk reels that accept powder chalk refills. Suitable for layout work on concrete, masonry, wood, and similar porous or semi-porous surfaces where permanent marking is acceptable.

Installation Notes

This chalk is installed by filling a chalk reel per the reel manufacturer's instructions. Because the formula produces permanent staining lines, verify that permanent marking is acceptable on the target surface before snapping lines. Keep chalk dry during storage to prevent clumping inside the reel. Disposal of chalk dust should follow applicable site and local environmental guidelines.