Hi all,

I remember reading recently about how to put the shine back in stainless after its been on the car a while.

Is it possible to use a similar technique to remove the blue/brown discolouration caused by welding an exhaust manifold together? I'd prefer it to be one shade rather than 2 tone!

I expect it's possible to polish it out. Certainly Frost sell some magic stuff to get bluing out of stainless steel exhausts....

I did a Google search on chemicals for removing marks made on heat-affected stainless steel - it's readily available, but it sounded so nasty that I decided to get the emery cloth / scotchpads out!

Most of the gels seem to have hydrofluoric acid in them... I chickened out...

[Edited on 25/8/09 by David Jenkins]

Try this stuff

this stuff

Just don't try using it as toothpaste...

Hi

Surely the manifold will just discolour again the first time you run the engine with 'gusto'

Regards Mick

Cheers ben, i will try that stuff out.

Mick - the discolouration is not from the exhaust gases but by the MUCH higher temps used to weld it together. I want to polish it out and then if it blues slightly on running it it'll still look better than it does now