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If I use the Boron spray on a mold on Saturday, am I able to delay the firing until Sunday? It would take me most of Saturday to get the project ready for firing and then firing may take 8-10 hours (I dont have an automated control box so its all manual from a kiln purchased 25 years ago.)

Hi - I am finally getting back to kilning after a 20 year hiatus!! So my question deals with a stainless steel flower former (which the glass drapers over). It has corroded after sitting in the garage for 20+ years. Should this concern me? I would plan to use kiln wash on the mold, but didn't know i...