I don't think it's possible with single mesh and layered material. If you'll use refraction in your condensation layer it will always sees through label. Either you sacrifice refraction in droplets or do as Lucutus already suggested - use separate meshes. I'd choose second option, because Corona still doesn't play well when refraction and layered materials involved in one place. Hopefully that will change in the next release when improvement in refraction materials behaviour will be introduced.