Keson ProChalk Marking Chalk Refill – 5 Gallon (48 lb.)

Keson ProChalk Marking Chalk delivers bold, highly visible chalk lines for professional construction, pavement marking, layout, and general contracting applications. Available in Blue and White, this standard-grade marking chalk features brilliant pigments that produce sharp, easy-to-see lines on a variety of jobsite surfaces.

Supplied in a convenient 5-gallon, 48 lb. bulk container, Keson ProChalk is ideal for contractors who frequently use chalk line reels and need a reliable, economical refill supply.

Formulated for excellent flow and consistent line quality, ProChalk makes filling chalk boxes quick and easy. Its high-visibility pigments produce strong, distinct markings, with 4–5 line strikes typically achievable and up to 8 strikes possible using proper techniques.

Key Features

• 5-Gallon Bulk Container – Convenient refill supply for frequent chalk line use
• 48 lb. Net Weight – Professional bulk quantity for construction and layout crews
• Available in Blue or White – Choose the color that best suits your marking application
• Brilliant, High-Visibility Pigments – Produces bold, sharp chalk lines
• Standard-Grade Marking Chalk – Designed for general construction and layout applications
• Excellent Flow Characteristics – Allows for easy, consistent chalk box refilling
• Multiple Line Strikes – Typically provides 4–5 strikes, with up to 8 possible using proper techniques
• Consistent Line Quality – Formulated for clean, easy-to-read layout markings
• Professional-Grade Performance – Ideal for contractors, construction crews, and pavement maintenance professionals

Available Colors

Blue ProChalk

A bright, highly visible marking chalk for general construction, measuring, and layout applications. Blue chalk provides distinct lines on many common jobsite surfaces.

White ProChalk

A versatile marking chalk that provides clear contrast on darker surfaces, including asphalt pavement. White chalk is particularly useful for pavement maintenance, parking lot layout, and other applications requiring visible temporary reference lines.

Ideal for Construction & Pavement Layout

Keson ProChalk is designed for contractors who need dependable chalk line markings when measuring, aligning, and laying out projects.

• Common applications include:
• Parking lot striping layout
• Asphalt and pavement marking
• Construction layout
• Concrete work
• Carpentry and framing
• General contractor layout
• Measuring and alignment
• Building and renovation projects

For pavement maintenance contractors, chalk lines provide a convenient way to establish straight reference lines before applying pavement marking paint.

Brilliant Color & Consistent Performance

Keson ProChalk uses high-visibility pigments to produce bold, sharp lines that are easy to identify during layout work.

Its free-flowing formula helps chalk move smoothly through compatible chalk line reels and makes refilling quick and convenient.

With proper snapping techniques, ProChalk can produce multiple visible line strikes, helping contractors work efficiently while reducing the need for frequent reapplication.

Product Specifications

What Is Keson ProChalk Used For?

Keson ProChalk is a professional marking chalk used in chalk line reels to create straight, highly visible reference lines for construction, pavement marking, carpentry, concrete work, and general layout applications.

The 5-gallon, 48 lb. bulk refill provides an economical supply for contractors who regularly perform measuring and layout work. Available in Blue and White, ProChalk offers brilliant color, excellent flow, and dependable line visibility for professional jobsite use.