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Aluminum Wheel Buffing
Each step of the process of putting a mirror finish on aluminum wheels brings the aluminum closer to a proud shine.
The number of steps required depends largely on the condition of the wheel itself. A good rinse and dry may be the one and only step if the wheels are in excellent shape. That same rinse may be the first of many steps if neglect has left the once shining wheels looking grey and cloudy. With a fair amount of elbow grease and careful use of power tools, even the crustiest of junkyard-sourced aluminum wheels can be brought back to a mirror shine.
Mags are named as such as aluminum is mixed up with a bit of magnesium to form a stronger alloy. This alloy is what requires polishing.
Stepping Stones
Buffing out aluminum, or any metal for that matter, involves smoothing out the irregular surfaces of the metal itself. While an aluminum wheel may feel smooth, the surface is actually quite rough when it comes to reflecting light. Under a microscope, a dull or pitted aluminum wheel would look sort of like a bowl of corn flakes. Jagged. Edgy. Rough. When light hits these rough surfaces, it diffuses and dissipates. The wheel appears dull, for the light stops at the surface. A polished aluminum surface under a microscope looks more like a bowl of hot oatmeal—a little bumpy, but mostly smooth and flat. When light hits a mostly flat surface it has nowhere to go but right back.
The best way to smooth out the peaks and valleys of aluminum is to use a series of buffing wheels and compounds. The spinning material of the buffing wheel works in conjunction with the abrasive material in the buffing compounds to smooth out the aluminum. The steps are key. Each wheel and compound must be used correctly and in sequence. Stiff buffing wheels with coarser compounds work into softer wheels and compounds with less of a bite. As important as the wheels and compounds is the technique. The right balance of rpm and pressure is the trick. Too little pressure and all that will happen is compound and bits of the buffing wheel getting all over the place. Too much pressure and the compound can burn the surface instead of buffing it. Practice on the back of the wheel to get a feel for the process before going nuts on the front. Always work from coarse to smooth, and use a dedicated buffing wheel for each compound.
Buffing
The first is to move the object around the buffing wheel. A standard bench grinder can be converted to a buffing setup with some ingenuity and a few arbors. Be absolutely certain the grinder is securely bolted down if this route is taken. The buffing wheel can easily grab the item being worked on. At this point, one of two things will give. Either the object will fly out of your hands, or the grinder will liberate itself from its mount. Either scenario is bad news.
Another route is to make the object stationary and move the buffing wheel around it. All manner of power tools are suited for this task. As with the use of any type of power tools, caution must be taken. At best, bits of the buffing wheel, compound, and microscopic aluminum dust will get everywhere. At worst, high-rev, high-torque power tools can be dangerous! Wear a mask, gloves, and safety goggles at all times while buffing aluminum. Finally, only bare aluminum wheels can be buffed out. The buffing process will quickly destroy any paint or clear coat on the wheels. Be certain bare aluminum wheels are what you have before beginning.
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