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re: "...do not currently have finances to change the rotors too. Is this necessary ?..."
Well, I'm sure you could have stoppable brakes without doing this (and I'm sure lots of folks would say they've changed pad materials without any ill effects).
On the other hand, if I wanted to gain an improvement from the new (presumed better) pads' formulations (because I really wanted something significantly better), I would want to have the materials on both sides (rotor and pad). So I would change rotor and pads. Not changing the rotors would only be disappointing.
You could have your rotors "turned" (in other words, lathed) to remove the old pad deposits -- but that just thins the rotors and leaves less mass to absorb heat energy and resist temperature rising -- IMHO never a good idea. And if you consider doing that, your near the cost (in your time and fees) of just replacing them with new rotors anyway.
Are the pads that you're using that bad that you have to change formulations? If you just need new pads because they're worn thin, just get the same kind -- and save up for when you can afford to do rotors and pads together if you really lust for a significant upgrade.
Some folks may disagree, but others may understand my reasons and agree.
You might also study further on pads and rotors from this website, among others:
http://stoptech.com/technical/
to study the subject and make your own educated conclusions.
Good luck.
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