with updated install- ss liner with wrap insulation, and with wood that is under 20%, I have been burning stove lower than I have in past. I have been cutting air back and, if I see secondaries, i leave it. Went to check top of liner today with flashlight and saw very thin shiny glaze on top inside of liner-appeared to extend about 6 inches or so. Vast majority of rest of inside of liner looked normal-with fluffy brown ask like soot. I called installer, who said that I should be burning a bit hotter. I described the paper thin thickness of the glaze and he said that, as long as I burn correctly going forward, that this is not a safety issue currently. He asked if I burned half a cord or less of wood-I said yes- less than half a cord. I wanted to see what you all thought given that shiny glaze creosote is not good