Yeah, I've heard of the spray on the rotor stuff. I think some are aluminum based. Supposedly does not reduce braking effectiveness.
Other companies make pads that leave a coating on the rotor. I think its called "TFT", transfer film technology.

alistair

On 2011-09-11, at 6:26 PM, Don Hanson wrote:

>  Brake rotor "paint"?  To stop brake squeal?  Coat the friction surface of
> brake pads with something, to stop brake squeal?  I dunno about doing that.
> I don't think that is good.  Brakes are made to work as they come from the
> manufacturer.  Any magic Goo you put on them, especially where the friction
> is 'supposed' to take place....that has to interfere with the stopping
> power....They were designed to have maximum power---pad against rotor.
> Period!
>   Maybe that aftermarket stuff you are putting between the pad and the
> rotor....that stuff is what is causing your brakes to not stop you very
> well, to heat up.  Who knows what that stuff is?  Why does that service tech
> "know" better than the original engineers who were responsible for making
> the best brake components possible?
>  You've said your brakes looked a little 'glazed' again....No wonder, you
> put 'stuff' on the braking surface, and that stuff got ground and baked
> right into the pads...
>  I never ever let anything touch either the pad surface or the rotors when
> I am doing a brake pad replacement or a rotor replacement....and I did them
> almost weekly on my 6-piston Brembo Big Red Porsche racecar brakes....The
> only thing that ever got on the surfaces that were supposed to supply the
> friction was brake part cleaner.....and then only if I'd made a mistake and
> then I never really trusted that set of pads.....Clean!  Clean!
>  The anti-squeal treatments I have seen are usually mechanical...some type
> of dampner device that is clipped or clamped to the back side of the pads to
> dampen vibrations and harmonics.
>  Geeze, on a vehicle with marginally adequate stopping power (if everything
> is just perfect) putting some solution between the pad and the rotors...that
> may just remove the "margin" and make the brakes...not quite adequate.
>  Not for me...I'd rather have squealing brakes than maybe run long at a
> stop sign, rolling into a busy intersection at the bottom of a long grade or
> something..
>  Don Hanson
> On
> 
>> Sent: Sunday, September 11, 2011 3:20 PM
>> Subject: Re: Brake Fade
>> 
>> 
>> Pistons and pins moving smoothly.
>>> 
>>> video of wheel cylinder "pullback" syndrome.
>>> http://www.youtube.com/watch?**v=mQrTuwBdXxs&feature=related<http://www.youtube.com/watch?v=mQrTuwBdXxs&feature=related>
>>> 
>>> Edward
>>> 
>>> At 05:45 PM 9/11/2011, Scott Daniel  - Turbovans wrote:
>>> 
>>>> sounds like progress.
>>>> I always put 'disc brake quiet' on the back of the pads myself.
>>>> 
>>>> I wouldn't go by appearance so much as how they feel and work..the
>>>> front discs and pads.
>>>> 
>>>> did you check for smooth movement of front caliper pistons..
>>>> and guide pins if it's the later style ?
>>>> 
>>>> I don't think you over did it especially ..
>>>> some hot brake smell by itself is not a big deal.
>>>> 
>>>> wheel cylinder 'pulling back'  ?
>>>> 
>>>> perhaps 'weak'  ?
>>>> 
>>>