Hydrogen18: Actually, MF is generally used in the capacitor industry to represent µF, while mF would be milliFarads. Just a note

. Dunno why they don't just add a µ (ALT+0181) to their printers and do it correctly, but whatever.
I think that what Grayson is saying is to choose capacitors that are rated for slightly more voltage than you will need. I agree, running things at their max tolerance is not advisable for this (only for computer hardware

).