What is you car's original color, red like your avatar?
What is your interior?
To me, tobacco or beige interior looks better with the darker blue, while black interior looks better with the LeMans blue.
GTA Alfa and I lean towards Hollandese.
Do some Google searches and then click images for lots of examples.
For what its worth, our professors taught us color theory in Graphic Design school in university.
They stressed not to have two dominant colors competing with each other.
Let one be dominant and the others subordinate.
My car is Bluette and I used Glasurit to give me some comfort the forumla was right. An authorized BASF shop had the formula on file, which is single stage, matched to two stage. Of course you can use single stage if you like. For what its worth I adore the color. So interesting and complex in different light.