Irwin Tools 8oz Orange Marking Chalk 64905

Irwin 8oz Orange Marking Chalk

The Irwin 8oz Orange Marking Chalk supplies high-visibility orange powder for layout lines on wood, concrete and metal. It is intended for carpenters, masons and general contractors who need a bold, temporary mark that brushes away cleanly after the job is done. The 64905 model comes in a standard eight-ounce bottle that fits most chalk-line reels.

Practical limits of dry chalk marking

Dry chalk lines fade quickly in rain, heavy dew or oily surface films, so outdoor work in wet weather needs a different marking method. Very rough or porous substrates can absorb powder unevenly, producing faint or broken lines that are hard to follow. The powder is not permanent and will wash or wear off under foot traffic or abrasion.