Hi,
I found an interesting assessment of the painting of US-made cars vs. China - hope it is of interest
insideevs.com
Summary:
- No significant differences in paint thickness across most of the measurement points - china made cars don't have thicker paint
- China-made cars have better paint quality than Fremont cars, less dust nibs, runs and less orange-peel after assessing several samples
- China cars have a paint quality comparable to BMWs and other premium brands
- Better, more even application on front bumpers with less bleed through of undercoat
- similar thickness overall to other car brands, no more, no less
- Paint on Model S is consistently thicker than same colour on M3
- No real difference in paint thickness between single coat paint (Black) and Multi-coat paint colours (Red, Blue, MSM). All about the same
Cheers,
Alex
I found an interesting assessment of the painting of US-made cars vs. China - hope it is of interest

Tesla Model 3 Detailed Paint Review: China-Made Models Vs US
This electric car expert has been testing numerous examples of Tesla Model 3 sedans built in the US and China to answer people's questions about paint.

Summary:
- No significant differences in paint thickness across most of the measurement points - china made cars don't have thicker paint
- China-made cars have better paint quality than Fremont cars, less dust nibs, runs and less orange-peel after assessing several samples
- China cars have a paint quality comparable to BMWs and other premium brands
- Better, more even application on front bumpers with less bleed through of undercoat
- similar thickness overall to other car brands, no more, no less
- Paint on Model S is consistently thicker than same colour on M3
- No real difference in paint thickness between single coat paint (Black) and Multi-coat paint colours (Red, Blue, MSM). All about the same
Cheers,
Alex