Does anyone know of a good mechanical pencil for marking on galvanized steel?

Work with a lot of galvanized steel and using a soap stone doesn t show very well and I have to resharpen it every time I use it to keep the lines tight so it will be accurate. Pencils work best but just like the soap stone, they dull out quickly. Is there a mechanical pencil out there that s durable that I could... show more Work with a lot of galvanized steel and using a soap stone doesn t show very well and I have to resharpen it every time I use it to keep the lines tight so it will be accurate. Pencils work best but just like the soap stone, they dull out quickly. Is there a mechanical pencil out there that s durable that I could use so I don t have to stop to sharpen it every time?
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