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Mold Making & Casting Class
I would try the dollar store. Menards has an off brand for a dollar, but it is gloss black. I honestly don't know. The author said they used krylon... But paint formulas change to..Maybe you have to wipe it clean between runs. Without moving it. Tricky..
Exactly what I was thinking since it is a double-boiler set up, which is really unnecessary for water, but extremely handy for other things.
People do that. You can also add a longer hose and run that through the water bath. You have to be careful to stop it before it is empty, and make sure your fitting are tight enough so they will come apart, otherwise the pressure builds up in the pot and explodes.
I think it is awesome! If the arduino has gpios left, you might get away with something like:https://www.ebay.com/itm/5X-LED-Light-Tactile-Push...then you can run the lights for the pattern with the gpio outputs and skip the tethering.. if you run them off a pwm you can get them to dim and stuff in haunted mode.
Worked perfect! I used like a hobby king ublox neo-m8n gps plus magnometer. It only had the sda, and scl wires on the 4-pin ardupilot/pixhawk i2c connector for the mag (which i cut off) but it worked! :)
Same here when I did mine.. But I used a 55gal drum, and it isn't a closed retort like yours, and probably doesn't make as good of char, but it is close enough for the moment. But my object was to get rid of the brush pile and have something to show for the work. :)
A simple rocket stove would be far more efficient for providing the heat. You could also put a bigger can around it or just mineral wool insulation to keep the heat in.