Interesting last 2 summers:
Specific to these 2 sets of wheels is no winters, no rain, 4,000 miles per year.
Last year, coated in Gyeon wheel coating, a set of wheels with gloss black lips and barrels with matte black faces. Used Iron X occasionally, but stuck mainly to car wash soap and appropriate brushes which included Incredibrush Flat. TONS of unremovable water spots on the faces, and lots of light surface marring on lips and barrels.
This year, new set of wheel in a brushed black tint finish with GTechniq C5, no Iron X used on them, just my car wash soap and Microfiber Madness Incredibrush, blow dry, then final wipe with microfiber full of BeadMaker. Wheels are still looking PERFECT.
So I’m curious if the matte finish responds different to coatings, not well, if the Iron X was too harsh, if the BeadMaker is really helping ceramic not water spot, is the GTechniq superior to the Gyeon wheel, was the Gyeon more susceptible to marring? Maybe a combination of all? Who knows, but much happier with my current process and products used.