I'm having the EXACT same issues with the PRNI clay, having little pinholes in my glaze firing Using only Slow fire cone 04 and slow glaze at cone 6
Let us all know how it went! I particularly want to know.... I was thinking holding top temp on Bisque leaving peeps out, then glaze fire hold 20 mins.. I'm a newbie, never have I ever made my own firing program and I'm afraid to do it wrong ...