i know, i keep bringing up when i used to belong to a club, but anyways...when i was, i did quite a bit of acid etching on glassware as we made glasses when we held our annual club fund raiser wine tasting event to commemorate it, and also to use as the awards for our end of year club competition....normally we just used stick on letters in an area on the glass that we portioned off, then applied the etching media over the letters...it created a reversed etching effect....but yeah, making customed stencils isn't easy, unless you are a great artist and good with an exacto knife....lol..