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Best marking device for black colored surfaces. Stands up to wet a little but I recommend drying surfaces off. If you have this item a scribe and a sharpie permanent marker. You can do layout on any surfaces.
I saw this product on a Youtube video and decided to try it. Marking lines with chalk for cutting and welding metal isn't accurate, and pencil is invisible. The Silver-Streak makes a nice sharp line that is easily visible through a welding helmet. Works on rusty, dirty, and greasy metal.