I have some swatches, of the same color, to show you tonight. I managed to pick up OPI's Eurso Euro last week :) I'm glad I did, since it isn't like any of the blues I have.
The first two pics are 2 coats of it alone, the next two show it with one coat of Polka.com over, and the last two are with it matted. Eurso Euro is almost a one coater, but not quite, and it didn't stain!!