Crescent Lufkin Chalk Refill CB08BL 8 oz Black Permanent Marking Dust (Anti Roll Bottle Easy Pour Nozzle String Line Reel Construction Layout)

High-Density Black Construction Marking Chalk Refill with Anti-Roll Geometry for Permanent Layout Lines

The Crescent Lufkin CB08BL 8 oz. Black Chalk Refill Bottle delivers an industrial structural marking solution engineered to snap permanent, high-contrast layout lines across outdoor construction sites. This heavy-duty black marking dust provides a bold pigment payload that resists weathering, rain, and foot traffic on raw concrete, light-colored roofing shingles, and structural framing lumber. The specialized 8-ounce squeeze bottle incorporates a unique non-roll perimeter geometry to keep the container anchored on sloped roofs, paired with an integrated easy-fill nozzle that accelerates powder flow into string line reels without messy mechanical clumping.

Best Used For:

• Exterior Foundation Framing: Snapping permanent layout boundary guides on raw poured concrete slabs and masonry blocks.
• Roofing Shingle Alignment: Marking high-contrast grid lines across light-colored roofing underlayments and architectural deck surfaces.
• Long-Term Timber Layouts: Establishing weather-resistant structural lines on dimensional framing lumber exposed to wet outdoor conditions.

Key Performance & Safety Features

• Weatherproof Permanence Matrix: Heavy-duty black pigment formulation delivers lasting surface adhesion that resists rain erosion and heavy foot traffic.
• Anti-Roll Bottle Engineering: Specialized non-cylindrical container geometry keeps the squeeze bottle securely in place on pitched roofs or uneven scaffolding.
• Clump-Free Flow Nozzle: Precision-molded tip aperture allows fine marking dust to dispense smoothly for mess-free string reel line filling.
• High-Contrast Definition: Deep black hue provides immediate visual clarity against structural wood fibers, gray concrete, and metallic surfaces.
• Universal Reel Adaptability: Micro-milled powder sizing works flawlessly inside all standard manual and geared string line chalk boxes.

What's Included

• (1) 8 oz. Bottle of Black Marking Chalk

Technical Specifications

Pro-Tip: Because black marking dust is formulated for long-term permanence, avoid using it on interior finish surfaces like drywall or bare trim. For exterior snaps, pull the line taut, lift straight up by 2 to 3 inches, and let go crisply to minimize shadow lines and secure a single hyper-accurate line mark.