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Why does nobody talk about using a soapstone marker on hot metal

Last week I was fitting a patch plate on a 200 gallon tank and kept losing my chalk lines as soon as the metal warmed up. An old timer handed me a soapstone marker and told me to try it direct on the hot surface. Worked like a charm, no fading even when the plate hit 300 degrees. Has anyone else switched from chalk to soapstone for layout work?
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2 Comments
thea246
thea2461mo ago
Did you ever have trouble with chalk lines disappearing on hot metal before trying this?
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karenm49
karenm491mo ago
Actually, chalk lines hold up fine if you let the metal cool down first.
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