IRWIN STRAIT-LINE 66402 Blue Marking Crayon – 4-1/2"

Makes clean, visible marks even when the surface isn’t ideal. Whether it’s wet lumber or oily metal, this crayon keeps your layout lines easy to see.

The IRWIN STRAIT-LINE blue marking crayon is built for jobsite conditions where standard markers fail. It writes smoothly on rough, slick, wet, or dirty surfaces, making it a reliable choice for layout work across multiple materials.

Why Contractors Choose It

🔵 Marks on wet, oily, slick, or dry surfaces without skipping

🔵 Bright blue color stands out for clear layout visibility

🔵 Waterproof formula holds up in outdoor and damp conditions

🔵 Non-toxic for safer everyday jobsite use

🔵 Works across lumber, concrete, ceramics, and metal

How To Use

1️⃣ Apply directly to the surface with steady pressure.

2️⃣ Mark layout lines, cuts, or reference points as needed.

3️⃣ Reapply for stronger visibility on rough or dark materials.

Additional Notes

• Length: 4-1/2"

• Ideal for framing, roofing, siding, and general construction layout

• Performs well in cold and wet jobsite conditions

⚠️ California Proposition 65 Warning

⚠️ This product may expose you to chemicals commonly found in industrial materials, which are known to the State of California to cause cancer or reproductive harm.