I have a 2 section easy fire 18 L&L. I don't have a vent and I fire with the top peephole out and I plug that hole at around 2/3 max temperature. I am having an issue with some minor pin-holing and I think it is either from my bisque not being allowed to burn off all the gasses because I am plugging too early, or my glaze firing is also getting plugged before the glazes can finish releasing the gasses. So I plan on leaving my top peephole out the entire time for the next bisque and glaze firing. I bisque to 05 and glaze to 6.
1. I emailed L&L and they said that a kiln of this size wouldn't have any problems venting with just the top peephole out, however they said I might need to plug the hole to reach temperature. Does anyone have experience leaving the top peephole out the entire time? The kiln doesn't seem to have any problem getting to 2/3's the temp with the peephole out at all. My first firing I plugged it at 1500, then the 2nd at 1900, and they both had the same exact time on the minute for getting to Cone 6. I was pretty impressed.
2. After the kiln shuts off, should I set an alarm when it reaches temp so that I can plug the peephole so that it cools in a normal time, or should I just leave the peephole out? I figured it would cool too fast with the peephole out and cause cracking or shivering? If I plug it right after it shuts off am I trapping gasses and causing pin-holing during the cooling?
I hope I explained this well enough. I am in my 3rd glaze firing coming up and I want to fix this minor pin-holing for good!