Another question. If you refire to your glazes maturation point could this repair pinholes without affecting the look of the piece to much? I suppose it would depend on how runny a glaze is?
I hate pinholes, they turn up in all the wrong places don't they? Yup, refiring can smooth over pinholes but not always. You can rub a tiny bit of dry glaze into the pins and refire. I would put those pots in the coolest area of your kiln if possible. Yes, most glazes do move more on subsequent firings to similar cones. Sometimes they look better, sometimes not so much.
Couple other thoughts about pinholes if they are a real problem, apologies if you already know this stuff.
- clean bisque firing to around 05 - 04 with good ventilation, avoid stacking pots inside each other
- sub out any ingredients that have a high loi rate, for example if your glaze has a large amount of whiting it helps to reformulate glaze to use wollastonite in place of it (and some of the silica). Talc and dolomite have high loi rates also. Can't always get rid of them but helps if you can swap for something else like frit 3249 to supply the magnesium for example.
- glazes with high viscosity take longer to heal over the pins. Longer soak at the top temp without over firing sometimes helps.