06-11-2021, 08:06 PM
I have a standard A7 cast iron exhaust manifold which appears to have been hot metal sprayed at one time (was that a "thing"? why?) Looks like aluminium or zinc coating, not sure how to tell.
About 50% has fallen off, revealing the usual rusty cast iron beneath, thus posing the question of how to remove the rest. A wire brush only removed very loose bits. Picking at the edges does start to shift it, very slowly. Not sure if shot /sand blasting would do the trick? - my local blasting business has recently changed hands and gone somewhat 'up market'. Needless to say if it costs more than £20 I might as well just look for another manifold!
Jon's acid bath perhaps?
Tempting just to squirt HT paint over it all but it will doubtless fall off before long.
Thoughts and clever ideas invited....
About 50% has fallen off, revealing the usual rusty cast iron beneath, thus posing the question of how to remove the rest. A wire brush only removed very loose bits. Picking at the edges does start to shift it, very slowly. Not sure if shot /sand blasting would do the trick? - my local blasting business has recently changed hands and gone somewhat 'up market'. Needless to say if it costs more than £20 I might as well just look for another manifold!
Jon's acid bath perhaps?
Tempting just to squirt HT paint over it all but it will doubtless fall off before long.
Thoughts and clever ideas invited....