This is a complete WAG based on a single comment made by Tom Zhu back in March: "Paint is expensive":
Tesla announced this week plans to build its next Gigafactory in Monterrey, Mexico. The announcement was low-key and the company didn’t release any details about when construction of the new facility will begin, but one […]
driveteslacanada.ca
"Zhu also said that Gigafactory Mexico will be the first Tesla factory to build the next-generation vehicle, as it was announced at Investor Day. From there Tesla will take their learnings and add the next-generation platform to their other Gigafactories. When asked if the next-generation vehicle will be painted or have stainless steel like the Cybertruck, Zhu smiled and said, “paint is expensive.”
With Tesla needing 3-5 more gigafactories to build Gen 3, with high-end paint shops costing a billion USD, and with after-market wraps now a profit center for Tesla, I'd be shocked if Gen 3 uses conventional autopaint.
Cheers!