Chris,

We use Rayzist's UV Glue http://www.rayzist.com/
click on support and then engravable blanks.

We do lots of this and yes we use a low viscosity UV activated adhesive. Although we do have one of the expensive UV lights meant for this, we also have a plain black light which also bonds the adhesive just fine. Either PhotoBrasive or Rayzist is a good source for the adhesive.

Mark