How to keep sharpie from coming off an iPhone case?

Yesterday I got my rubber iPhone case signed by my favorite band ever! I want to continue using the same case but I don't want to autographs to fade at all! It was signed with a sharpie and I was wondering if putting clear mail polish over the autographs will keep them from fading? Any advice would help!

Id say hang it on your wall and buy a new case

I think that sounds like a good idea!

Nail polish could work depending on the brand but I would recommend getting some sort of sealant for that

Get a new case maybe?
If not try the polish! What band?

I would be very careful what nail polish to use. Some nail polishes contain chemicals that can attack and melt rubber / plastic.

If the autographs are that important to you I would take the cover off and maybe just use it for special occasions.