Did I explain that well? Probably not. A friend is looking for something that he can print to with an inkjet printer, and then stick to metal, glass etc but from the inside. Something like car alarm stickers. Has to be transparent and not wipe off when you so much as look at it!

Does this clear, printable, durable, self-adhesive product exist?

edit: sticking to metal from the inside is pointless, but you see what I mean.