I used 3 bases and I was fine (UDPP, MAC prep & prime for eyes and paint). lol Because the Metal X are thick cream shadows anyway, its better to have a thicker base as well to hold it in place. Thats my 2 cents. And you need to top it off with shadow IF you are using it as an eye color. No creasing AT ALL.
I use Fusion Gold on my cheeks and have no problem, but I did use it thin. Its lovely <3