Well, seeing as that temperature is in the controlled first part of most fusing/slumping schedules, I guess I'd take it up at the same speed, or slower depending on how many times its been in the kiln, than you would for the full process.
i.e if its a large piece, I'd go around 166 degrees per hour, if it is a larger piece.
If you google for it, there's quite a few references, more on th US forums, so the information might be out there, otherwise, you could always ask the supplier you got it from.
Warm Glass sell this
http://www.warm-glass.co.uk/over-glaze-super-solution-8oz-p-929.html, which says its suitable for food bearing surfaces.
I've never used either though
