I dismantled my stove last w/e for end of year cleaning. I was careful to use almost no wood this season but I did burn some 2 yr old dry hickory & oak in April.
I discovered some crusty like substance in my ss liner. Wasn't quite as black and sticky as creosote. More like a dry crusty dark grey cement like substance. I'll post some photos maybe this w/e. But I am a little concerned as I expected to fine nothing more than fly ash.
I did switch coal suppliers in April when the cold air hung around. I wonder if maybe I was using some lower quality coal.
Any ideas what it may of been?