Front view of an 8 oz yellow bottle of IRWIN STRAIT-LINE Blue Marking Chalk, highlighting its standard permanency rating and high-visibility blue pigment for professional layout snapping.
Handheld view of the IRWIN 64901 marking chalk bottle showing the blue flip-top cap designed for airtight storage and easy mess-free refilling of chalk reels on the jobsite.
Front view of an 8 oz yellow bottle of IRWIN STRAIT-LINE Blue Marking Chalk, highlighting its standard permanency rating and high-visibility blue pigment for professional layout snapping.
Handheld view of the IRWIN 64901 marking chalk bottle showing the blue flip-top cap designed for airtight storage and easy mess-free refilling of chalk reels on the jobsite.
IRWIN

IRWIN Strait-Line 64901 8 oz Blue Marking Chalk Refill Bottle Temporary Light Pigment Airtight Cap Residential Carpentry Framing Woodworking Guide

In stock
SKU: 64901
$1.49 USD

Description

Achieve Crisp High-Contrast Layout Lines with IRWIN STRAIT-LINE Blue Chalk

Acquire the IRWIN 64901 Strait-Line Blue Marking Chalk Refill to establish clean structural guides across framing, carpentry, and finish trim projects. Formulated specifically for temporary interior layouts, this professional marking compound features an 8 oz reservoir capacity packed into a compact container engineered for mess-free deployment. The mixture delivers high-visibility line saturation without permanent bleed-through on standard drywall, lumber, or concrete surfaces, while the innovative flip-top cap forms an airtight seal to block jobsite moisture and completely eliminate pigment clumping during long-term storage.

Best Used For:

  • Interior Wall Framing: Snapping temporary layout boundaries across wood and metal plates without permanent staining.
  • Drywall and Sheetrock Layouts: Creating sharp, high-contrast cutting guidelines that vanish effortlessly under paint primers.
  • Cabinetry and Trim Work: Marking precise vertical and horizontal alignment paths on exposed finish surfaces.

Key Performance & Safety Features

  • Airtight Flip-Top Cap: Seals the bottle to prevent moisture intrusion and significantly reduces the risk of chalk clumping.
  • High-Visibility Blue: Provides a sharp, high-contrast line for easy reading on most residential and commercial surfaces.
  • Temporary Marking: Engineered for precision layouts that can be cleaned or covered, making it ideal for interior finish work.
  • Consistent Flow: Formulated for uniform distribution and superior line saturation within any standard chalk reel.
  • Professional Grade: Part of the trusted IRWIN STRAIT-LINE family, designed for daily use in demanding construction environments.

What's Included

  • (1) 8 oz. Bottle of IRWIN STRAIT-LINE Blue Marking Chalk

Technical Specifications

Specification Field Measurement / Value
Brand IRWIN® STRAIT-LINE®
Model Number 64901
Chalk Color Blue
Container Size 8 oz. Bottle
Permanency Level Standard (Temporary)
Cap Type Flip-Top (Airtight)
Product Weight 0.39 lbs
Product Height 0.39 in.
Product Length 0.39 in.
Product Width 0.39 in.
Pack Quantity 1


Pro-Tip: Before snapping onto finished drywall or trim boards, lightly tap the filled reel housing against your palm to drop excess cake off the line. This prevents unwanted chalk splatters, ensuring a laser-thin line that can be dusted away effortlessly once framing attachments are secured.