Metal polishing?
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You're basically sanding & smoothing out the surfaces with something that leaves scratches that look large to the eye, then progressively making smaller scratches to remove the larger ones till the eye can no longer see them.
That's the basic idea for any surface. Now what's involved & what method varies significantly with different materials. Many different selections of methods & supplies can accomplish a similar result eventually, some much slower than others.
I assume you're working on an aluminum sheet metal intake which I don't know the surface condition of, so I'm giving general recommended instructions Based on you NOT having professional compounds, buffing wheels & tools.. Something like mothers is ok once you have the base material smooth enough. Get an assorted pack of wet dry sandpaper & experiment in small sections. No need to sand rougher than needed to remove existing scratches, you can always step to a heavier grit & then back to finer. Try 1000 grit, sanding in a few directions in an area, & see if you can see any heavier scratches through it. If so go to 800, 600 or heavier if it's bad enough. If ok go finer to 1500 ,2000 & even finer if available. Then switch to a paste, cream or heavy liquid, then a finer product like white diamond for a final shine.
This was just a rough example of a plan of attack for sheet aluminum for someone with few tools. Someone like me with professional buffing wheels, a 1 hp motor & compound sticks may stop sanding at 400 to 800 grit & proceed with buffing tools. No one way to do this.










