Hi Noodles,
I know I can't give you an official answer, because I've really not any experience here. I'm not a nail artist. But I'm one of the people who make the fimo nail art canes, and I've been experimenting with them.
I did notice that it was more difficult to do the nail art with just nail polish, and here's why: 1, it takes quite a few coats unless the slices are very thin. Since those of us who make the canes slice them by hand, there is going to be some variation in the thickness of the slices. My slices average about .5mm but even that is really too thick for nail polish alone unless you have time for 4 or 5 coats to get a perfectly smooth surface.
Now you can fix that by sanding the nail art after it's been glued onto the nail. But thicker slices - and by this I mean ones that are still less than 1mm thick - are going to take some patience to get a fully smooth surface. And if you like a layered look, it will take you maybe a half dozen coats of polish to accomplish that look.
And 2, the enamel nail polishes will have a chemical reaction with the clay slices, and you'll have little areas of bubbling over the top of the nail art or they may peel away from the nail. Using an acrylic nail polish helps with that, I noticed. So you just have to be careful about which one you choose.
So since I was coming in to post a couple of experiment nails anyway, I'll show you what I did with some of my nail art slices and some full-coverage artificial nails:
I used the inexpensive nail acrylic you can get at stores, and I did the mixture fairly wet so the acrylic was thinner. I paid special attention to the edges of the slices. Now each of these nails took me a total of maybe 5 minutes of direct working time (aside for drying time).
It's fun doing this because I can vicariously have pretty nails. LOL the irony here - raw polymer clay eats through nail polish so I can't wear anything but the stick-ons when I want my nails to look pretty! (Although... I've been wanting to see if I could use clear resin over the nail acrylic. The raw clay doesn't eat through resin so that might work!)
:lol:
Cat