Ive tried water based enamels and the end result was very disappointing. So much so, I rubbed it back and went with conventional enamel
Ive used water based polyurethane and again, it was disappointing.

I don't touch water based anything due to poor performance and finish.

If this is true that oil based and solvent based paints are no longer allowed to be used in China, it doesn't look good for the car industry!