I shut down my boiler a couple days ago when we ran out of wood. Today, I cleaned the ashes out of the firebox and ash tube, vacuumed the crud that fell down around my blower, oiled the hinge on the blower, cleaned out the horizontal section of chimney surrounded by the water jacket, unplugged the pump, shut off the valves, and capped the chimney.
I also scraped creosote off of the inside of the door. In doing so, I started scraping the gooey stuff near the bottom of the door and it started coming off in floppy chunks. Oops, that's the door seal that Heatmor uses. There's door seal rope behind it, but that stuff looked like black silicone caulking or something. I went ahead and took it all off since it needs replaced. Any ideas what that stuff is and where to get more of it? It goes between the rope in the door (holds it in place and is about 1/4" thick over the rope) and the steel lip on the firebox that the door seals against. Clearly, it must take some pretty good heat.