This cone 6 vase was made using a coarse-grained stoneware. That generates lots of gases on firing, and it left behind plenty of pinholes as a testament. Today I still use clays like this but my pieces have almost no pinholes. Why? Electronic kiln controllers enable me to do drop-and-hold and slow-cool firings. It is that simple. Well, actually, there is another reason: I make sure my glazes have adequate fluidity to be mobile enough to heal the holes during hold, but not so fluid that they percolate while doing that (producing blisters and micro-bubbles).
Glaze Pinholes, Pitting
Analyze the causes of ceramic glaze pinholing and pitting so your fix is dealing with the real issues, not a symptom.
Pinholing is a common surface defect that occurs with ceramic glazes. The problem emerges from the kiln and can occur erratically in production.