Irwin 4935519 Crimson Red Chalk 6 Oz Permanent Exterior

Product Description

The IRWIN INDUSTRIAL TOOL CO 4935519 is a crimson red powder chalk formulated for permanent staining applications on exterior surfaces. Sold under the Strait-Line line, this 6 oz chalk is designed for trade and jobsite use where long-lasting line visibility is critical. Unlike standard chalk that washes away quickly, this formulation stains the surface, reducing the need to apply spray sealant after snapping a line. It remains visible after weeks of weather exposure and normal jobsite wear, making it a practical choice for outdoor layout and marking tasks.

This chalk is intended for exterior use on concrete, masonry, wood, and similar jobsite surfaces where a durable, weather-resistant reference line is required. It suits applications such as roofing layout, concrete flatwork, framing, and other construction trades where lines must remain legible through rain, foot traffic, and prolonged outdoor exposure. The permanent staining characteristic makes it well suited for situations where re-marking the same line repeatedly is not practical. Package quantity is 6 units per pack.

Key Features

• Permanent staining formula stains the surface for long-term line retention
• Remains visible after weeks of weather exposure and jobsite wear
• Reduces the need to apply spray sealant after snapping lines
• Crimson red color provides high contrast on a wide range of exterior surfaces
• Designed specifically for exterior use
• 6 oz powder chalk per unit, sold in a package of 6

Compatibility

Designed for use with standard chalk reels and chalk line tools that accept powder chalk. Intended for exterior layout and marking on construction and trade jobsites.

Installation Notes

Loaded into a chalk reel by a carpenter, roofer, concrete finisher, or general trades worker. Keep the chalk dry during storage to prevent clumping and ensure consistent line quality. Because this chalk permanently stains surfaces, confirm the intended snap line location before use, as removal is not possible after staining. Follow all applicable jobsite safety guidelines when working at height or in proximity to other trades.