Has anyone here sprayed single-stage metallic?

A friend of mine on the other side of Finland is doing a nut-and-bolt restoration of an early ‘70s Opel Diplomat. He chose to paint the car with Tikkurila Temadur 90, an industrial 2K polyurethane that’s a single-stage silver metallic. He’s not happy with the result, mainly because of tiger striping. From what I’ve been able to find, he used a generic, inexpensive thinner that appears to have been a fast thinner. He also sprayed the car with a sub-$100 bottom-feed spray gun (probably not ideal! 🤣).

He knows I’ve been trying to learn automotive painting and has invited me to respray the car. I plan to use an Iwata WS-400 Series 2.1 Clear gun with either a 1.3 HD or 1.4 HD setup. I’ll spray a number of test panels in my shop before driving over to paint the car. I’ve already picked up some slow thinner for the test panels, as I think it may help reduce tiger striping, especially since it’s a relatively large car.

Any advice would be greatly appreciated! I’ve only sprayed one complete car before, and that was more than 30 years ago. The doors will be installed, but the hood, trunk lid, and sunroof will be sprayed separately on stands.

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Has anyone here sprayed single-stage metallic?