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Showing results for tags 'differential hardening'.
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Alright, so I bought one of these after my horrible clay-mixing and furnace cement experiences... I applied it in a very thin layer to the blade, and let it dry for like... hour and a half. (from my understanding, this can be used right away, and does not actually need to dry for the purpose of differential hardening. Besides, instructions on the tube read "dry for at least an hour".) But to my great surprise the thin layer expanded like a baloon as soon as I moved the knife into the forge... I mean - it was instantly. They blew up to large hollow bubbles on the blade. I saw no other option but to scrape the damn stuff off (which proved quite the challenge btw.) and apply my old refracory cement and steel wire. (I just quenched the blade... no problems. ) Anyhow, is this bubbling of the Rutland Black Furnace Cement normal? Sincerely, Alveprins.