electrolytic series to double voltage question

[kramden66]

if you put two electrolytic capacitors in series to double voltage the value is cut in half , example two 100uf @ 450 volts becomes 50uf @ 900 volts correct ? so my question is when doing this you just hook them in series and thats it ? you don't need to add a resistor ? just trying to get around a 475 volt issue , a 450 there might work but the surge would be why they put a 475 volt cap there in the first place.

thanks
mike