A number of Australian Atto 3 owners reported rust, with the likely cause identified as preparation of the metal before paint went on. It appears to affect a small proportion of cars and BYD has responded to the cases raised - but it is worth a look, because it is the one paint-related fault that starts on the inside.
This is the honest limit. Ceramic coating protects a surface from what lands on it - UV, contamination, water spotting. It has no effect at all on corrosion working its way outward from bare metal beneath the paint. If we find blistering we will point it out and tell you to raise it with BYD, not sell you a coating over it.
Electric vehicles across the industry have moved to thinner, lower-solvent paint. It corrects less forgivingly than the thick finishes of twenty years ago, so measuring before machine work matters more than it used to.
Salt in the air accelerates corrosion anywhere paint is already compromised - a stone chip through to metal, a scratched sill, an unsealed edge. On the coast, small paint damage becomes a rust problem much faster than it does inland.
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