Keson 5 lb. Blue ProChalk Standard Grade Marking Chalk

The site standard for everyday layout. Blue ProChalk delivers crisp, easy-to-see lines that snap cleanly on wood, concrete, and sheathing—ideal for framing, roofing, masonry, and general construction. The finely milled, standard-grade formula flows smoothly, sticks well in dry conditions, and wipes or rinses off when the job is done. The bulk 5 lb jug keeps crews moving with fewer refills and less downtime.

Key Features

• Worksite-standard blue color: Balanced visibility for indoor/outdoor layout without being overly bold.
• Standard/removable grade: Temporary marks that typically clean off with a wipe or rinse (always test first).
• Finely milled formula: Smooth loading, even coating, and sharp, consistent snap lines.
• Good adhesion in dry conditions: Clings to wood, concrete, drywall, OSB/plywood, and subfloor sheathing.
• Universal compatibility: Works with most chalk line reels from major brands.
• Bulk 5 lb jug: Economical for crews; fewer refills on big jobs.
• Jobsite-friendly container: Resealable cap and pour spout to help prevent spills and caking.
• Versatile applications: Framing/layout, roofing lines, fence runs, masonry guides, and general construction.

Brand/Model: ProChalk Standard Grade, Blue

Product Type: Marking chalk powder for chalk line reels

Color: Blue (worksite-standard visibility)

Material: Finely milled calcium carbonate with inert pigments + flow/anti-caking additives

Form: Dry powder

Net Weight (Weight): 5 lb (2.27 kg)

Container Type: Resealable plastic jug with pour spout

Container Dimensions (L × W × H): ~10 × 6 × 4 in (approx.; varies by packaging)

Compatibility: Standard chalk line reels (most major brands)

Surface Suitability: Wood, concrete, drywall, OSB/plywood, subfloor sheathing (best in dry conditions)

Permanence: Standard/removable grade; typically wipes or rinses off (always test first)

Mark Visibility: Balanced indoor/outdoor visibility; crisp, easy-to-see lines

Primary Use Cases: Framing/layout, roofing, masonry, fencing, general construction

Operating Conditions: Use in dry weather for best adhesion; re-snap if exposed to moisture

Storage: Keep sealed and dry; avoid humidity to prevent clumping

Safety Notes: Avoid inhalation/eye contact; basic dust precautions recommended

Country of Origin: Varies by batch (check product label)

Manufacturer Part Number (MPN): Varies by supplier (commonly listed as ProChalk Blue 5 lb)

Q: Is the blue chalk permanent or removable?
A: It’s standard/removable. Marks typically wipe or rinse away; always test first on porous or finished surfaces.

Q: Where does blue perform best compared to other colors?
A: Blue offers balanced indoor/outdoor visibility and is less prone to staining than bolder pigments—great for general layout on wood, concrete, and sheathing.

Q: What surfaces and conditions give the best results?
A: Dry wood, concrete, drywall, OSB/plywood, and subfloor sheathing in dry weather. Moisture or dust can reduce adhesion—re-snap lines if needed.

Q: Any tips to avoid mess and speed cleanup?
A: Don’t overfill the reel, keep the fill cap closed, snap on clean, dry surfaces, and clean soon after use—start with a dry brush, then a damp cloth if residue remains.