We built our oven up to the vent & chimney in 2010 and for a variety of reasons didn't get to finish it until this summer. Consequently the dome had a long time to sit. It was covered with a layer of waterproof reftractory cement the entire time. We are finally starting to cure it and this morning as we lit the fire we noticed a small crack in the top of the dome with whisps of smoke coming through (the fire got up to 500 at the top of the dome for short periods last night, we found it very hard to keep the temp low). We also have a unique dome top, it isn't perfectly round. It has a kind of a point in it. I've attached photos of the dome and the crack. Can't see up into the dome its self at this time as its pretty black in the and hot at the moment. My questions are: 1) should we repair the crack and if so how; and 2) does anyone think the point in the dome will be an issue and if so would we have to grunge around inside the dome and fill it in? We're praying that will not be necessary.
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smoke coming out top of dome