This is a kiln I converted for powder coating and other things including heat treating metal. I have used the stink out of it as a powder coating oven. I like the fact that I can hang things. The control is done with an old OOPIC microprocessor an solid state relays.
The control I have has been very useful. I have it programed into climb segment, peak temp segment (for flow out) and hold segment (for cure). I start the kiln to bring it up to temp, get my parts ready. Drop the parts in and re-start the peak segment and it's automated form there. I walk away and pull the parts out when done.
I have done at least a 100 items so far. Rebuilt an old Chrysler 230 in a fork truck and threw everything in I could imagine. Even did high temp headers on a V6 in an MGB. Working on parts for a Ford 8N restoration now. Nice to have the ability to take the temps up higher for ceramic coatings where ovens can't go.