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One thing to think about........if you remove the clear coat on aluminum wheels, they are basically exposed, and depending on the grade of aluminum, they can oxidize VERY easily and turn a yellowish color. When clean.....they will shine like nobody's business, but raw aluminum is a PITA to keep clean. Ever owned a set of Weld wheels? They polish up like a *****.....but impossible to keep that way
One thing to think about........if you remove the clear coat on aluminum wheels, they are basically exposed, and depending on the grade of aluminum, they can oxidize VERY easily and turn a yellowish color. When clean.....they will shine like nobody's business, but raw aluminum is a PITA to keep clean. Ever owned a set of Weld wheels? They polish up like a *****.....but impossible to keep that way
I imagine that if the salt from the roads gets on it it will oxidize very quickly. Aluminium when prepped properly is very easy to keep shining as long as you do it regularly like every time you wash the truck give it a quick polish and it wont take a lot to bring it up, leave it for a while and that is when it becomes a PITA. I had a local I did a set of wheels for and they gave them a quick polish every time they washed the car, they stayed good for 4 years untill they sold the car. If you have polished stuff and have to drive on salty roads or the beach it is best to cover the alloy with a film of spray on oil like WD40 or somthing similar this should help.
Also remember that if they are covered in dirt or the like dont wipe it off hose it away with high pressure, every time you wipe it with dirt on it you scratch the flat surface that give the best shine, it is also good not to let the water dry on it as over time the chemicals in the water will stain the alloy best to blow dry or chamio.
To be truthful I have never tried clear from a spray can. We did try to 2 pac clear coat a magnisium bike wheel of mine. It seemed fine and had a couple of runs, when we tried to rub the runs out the paint was still wet underneath [2 days later it was winter] so we ended up pealing the whole lot off.
I personally dont like to clear coat as it only takes a couple of stone chips, the moisture gets in and then the corrosion starts, then you are back to square one. I would think that a good quality clear powder coat would be better as it is very hard. But I would speak to the powder coater first and make sure he will waranty the coat agains discoloration. Hope I havent created more questions than answers
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