What makes nail polish to create bubbles after applying?

I always want my polish on my fingernails to be smooth and even. But there are times when there are hardened gas bubbles or blisters (or whatever you may call them) on it after applying. Is that because of too much polish, or is it because of the heat or expiration? And how can I prevent them?What makes nail polish to create bubbles after applying?
This will usually occur when you have applied a layer over another without the first one drying enough. The trick is patience, apply a first single coat thinly, allow to to dry completely and then apply a second coat and you should have no more bubbles.What makes nail polish to create bubbles after applying?
Caused by to many coats applied without allowing each coat to thoroghly dry. Adding a dryer expedites the process.
Do you shake the polish before applying? that may be the problem
I was told by a manicurist that it was caused by shaking the bottle too much also. The best way to make sure it is mixed correctly is by rolling it between your hands, and then letting it sit for a minute or two while you soak, etc.
I always roll the bottle between my hands for a couple minutes and it prevents those bubbles. I don't shake it because it can sometimes actually make bubbles.
its a combination of too much polish and you touching things beofre your nails are dry.
The reason for the bubbles is you are applying the polish too thick or you are applying layer after layer and it doesn't have time to dry. SOLUTION: Polish your nails in thin layers, at least 1-2 in between the other, so that all nails dry evenly. Apply clear nail polish, and voila!
it is often because the polish is not blended very well. make sure to shake the bottle a good bit (there is usually a little ball in the bottle...shake it until the polish is thick enough to barely hear the ball rattle.





it could also be that the polish is kind of cheap/old.
I was told by the gal who did my nails that the bubble are caused by shaking the bottle too much.
I read the answer to this in ';Deep Thoughts';, by Jack Handy, but it escapes me now.