As a bit of a glue nut, there are quite a few different UV adhesives most typically varying in viscosity for different tasks. But for all of them you want a relatively thin layer that can be cured by a light source. If you're working in an area with UV exposure it may set rapidly on you, and generally you tend to "build up" the glue for larger projects.
But I wonder if your customer is talking about something else. Sure they're not crossing it up with UV printing? I'm a relative newb, but isn't acrylic a common challenge for which you might use UV printing? Hence a print with a UV bond. Could that be the case?