it makes cleaning easier. on my dd's i use polymer based spray sealant called Prima Hydro. you can buy it from detailersdomain (vendor) or amazon. ive tried 'wheel wax' products and they're not that much better.
on my hobby cars i just use the wax in the QD (griot's speed shine). spray into towel and just wipe off the dust. i dont drive my Z in the wet.
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