simulate this circuit – Schematic created using CircuitLab
It is known that we can use series capacitors to increase rated voltage. But I want to know how far we can push this feature to? Suppose, each of this capacitors are identical, 200V rated and polarized. We also know that polarized capacitors can be turned into nonpolarized by connecting their negative terminals as in the scheme above.
So, in the circuit above, can I safely say that I have formed a 25 mF - 400V rated capacitor? If I charge them up to 400V, then discharge them down to -400V, should I be expecting some problems? I suspect, over time the voltage of each capacitors will be varied and after a some point, one or two of the capacitors will be holding more than 200V (or be holding negative voltage) and blow up. If so, is there a way to prevent that and safely form a higher voltage rated, non polarized capacitors by polarized capacitors?
edit: I editted the question to be more clear. Two series polarized caps forming a nonpolarized cap has the same rated voltage.
edit2: I'm editting the question just to address the diferences between this other question on stack. Firstly, the questions are entirely different. In my question, I am aware of that we can form a non polarized capacitor out of two polarized capacitors. Secondly, I am asking for a safe design guide. I provided a schematic to demonstrate my particular problem.