I “soak” in my electric kiln because it has a controller, so I program it to hold the final temperature for the number of minutes I think it needs before I allow it to cool down, not sure how you would soak without the controller though.
I have put matte underglazes over a gloss glaze. Sometimes they retain their matte finish and don’t move with the other glaze, and sometimes they blend in and look good, although I have found that some colors tend to burn out and leave streaky colors – mostly those in the red, pink and orange range. I would test on a tile first to see what your final result is going to be.
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