Decal to put on wallpaper?

[euroa guitars]

I am wanting to put an Ibanez logo on a wallpapered guitar on the headstock. The wallpaper is not too thick or anything but which ways can i put a decal on?

waterslide only or anything else...

Hi just seen this post so don't know if you have done anything yet. I would spray the headstock with an Acrylic clearcoat first and then put on the waterslide decal followed by more clear coats once the decal has dried. (Allow a couple of days for the decal to dry thoroughly).