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As long as the paint doesn't run I don't see why the particles would move around, and I don't think wetsanding would be impeded too much given how small these particles are, plus with how many coats I plan on putting on it should cover nicely. I guess I'll find out.

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Ahhhh... I think you had better test this all out on some sample. You are introducing too many new variables into the recipe and each of them on their own has proven not to work very well on their own.

The metalic pieces may be small... and that works great with the spray where they are atomized and randomly distributed during the painting. But when you roll.. you are going to find the metal particles concentrating in lines ( that will follow the pattern you rolled the paint on ). The ends of the rollers will leave a slightly greater concentration of metal particles - and hence you will see a pinstriping type effect instead of an even distribution of the particles.

You might as well spray if you are planning to go with that automotive metalic paint. I imagine that any attempt to roll with that paint is going to result in something that is going to have you cursing.

It's a gorgeous color... but the paint and metalic particles is going to prove to be its downfall when rolling and when wetsanding..

Do a sample... but don't do it on the car until you have proven to yourself that it is not going to look like a dogs breakfast