has anyone tried making an oven, by placing a PCB in a mineral oil bath and keeping it at a constant temperature? it feels intuitively that it could maintain a constant temperature better and more evenly than anything else, virtually eliminating temperature gradients, but I'm not sure about the effect of mineral oil on electrical signals, could it inject any noise? could very small currents flow thru it? and such, even if it is non conductive; P.S. to answer a part of my question, I guess it depends on its purity and contents, if it has impurities in it, that could be conductive, even if barely. It demands an experiment
the next best thing could be to submerge a sealed PCB in mineral oil, then conductivity and purity wouldn't be a problem