Re: slot mag polishing
I get the buffing wheels and rouge from my local Kenworth dealer. They have everything you need. I also use the Orange and White 3M bottles of polish. Forged and cast wheels are different. Forged are easy and polish to a mirror shine. Cast like yours are porous and when they are as old as slots that have not been made in decades they can have some corrosion. I have taken a set of cast slots and gone through 3 stages of grinding with the little 3M cups with all the little fingers and they came out looking very nice but up close you could see the casting pores. An old set of forged M/T / Alcoa Challengers I did for my jeep came out so nice they were just beautiful. You can also just acid wash them with alu wheel cleaner or muriatic acid at some level of dilution which is where I usually start with very old machined cast wheels.
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