Can I use nail polish to color the cracks on a iPhone?

I have a black I phone and the back of it is cracked. I wanted to do the colored crack thing that people do. I tried using hi lighters and sharpies but it didn't work. I heard that nail polish works but how would I do that?

Maybe If Hi Lighters Won't Work Maybe You Should Try Nail Polish

Why not? Use Acrylic paint, and it should do the job.

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