Hi,
so here's some more thoughts about the glove box:
- furnace
That furnace is electrically powered (you probably shouldn't use a propane furnace indoors), it's tiny so less heat is wasted, and due to its size it should be possible to attach it to the back side of the glove box. I still think that having the furnace inside the box is a problem because the heat cannot escape well, but having it outside and connecting it through another opening in the box should be possible.
- insulation
These boards are used to insulate masonry heaters from walls and can take up to 1000°C -- the outside of the furnace is probably not as hot, so that should be enough. My guess is to use high-temperature mortar to glue the boards to the furnace (keeping the inside dust-free, it's a clean room after all) and something more flexible, e.g. high-temperature silicone, to glue the boards to the back side of the glove box. If both connections were rigid then it would break too easily, especially with thermal expansion.
The alternative would be rock wool, but that stuff is nasty (at least if it's similar to glass wool). Calcium silicate is similar to gypsum in handling, just more expensive.
- spin coater
My first idea to make this cheap is an axle connected to a disk and mounted in such a way that the axle can spin but not tilt. You could then attach a handheld drill to the bottom of the axle to spin it.I still like the idea except that the disk has to be inside the glove box and the axle has to leave the box at the bottom, so keeping it dust-tight AND freely spinnable but not tiltable is the main challenge with that. Someone who is wiser in mechanics can probably do that easily.
Greetings,
Martin