Irwin Strait-Line marking chalk creates weatherproof marks that resist immediate washout. In typical Oregon drizzle, marks will remain visible for several hours, giving you plenty of time to complete your installation work. Heavy rain will eventually wash away the marks, but they're designed to last through normal working conditions.

Yes, the marking chalk works excellently on painted fascia boards. The bright yellow color provides high visibility on both light and dark painted surfaces. The marks can be easily wiped away after installation is complete.

Unlike chalk lines that use powdered chalk and a string, this is a solid chalk stick similar to a large crayon. It's perfect for making quick reference marks, short lines, and measurement indicators without the mess of powder or the setup time of a chalk line. Many contractors use both tools for different applications.

Yes, the marking chalk works on metal gutters and downspouts. It's ideal for marking cut lines and assembly points. The marks are visible but can be wiped clean before final installation.

A 4oz marking chalk stick provides extensive coverage for typical gutter installation projects. Most contractors find that one stick lasts through multiple residential gutter installations, depending on the amount of marking required. It's economical and long-lasting for professional use.

Yes, Irwin Strait-Line marking chalk is safe for use on wood, metal, concrete, stucco, brick, and most other construction surfaces. Always test on an inconspicuous area first if you're concerned about staining on particularly porous or delicate surfaces.