Make stickers stay on plastic with clear nail polish?

I got some stickers from Urban Outfitters, and I used them to cover my iPhone case, which is made out of plastic. But I want to make sure the stickers don't peel off. Will a coat or two of nail polish top coat be of any help? I don't have decoupage glue or whatever. I was thinking that the nail polish would help temporarily. And are there any other ways to get stickers to stick well to plastic?

You can spray over it with a clear spray paint. You can get it for $2-$3 or less at walmart or most dollar stores. I'd recommend a glossy finishing spray. Make sure whatever you buy is safe for plastic(it should say on the back of the can do not use for plastic, ect…) One coat will probably do, but if you spray 2-3 it will have a better finish and last longer. Make sure you let it dry completely between sprays.

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