Seeking assembly suggesitons

[groston]

All,

We are a startup company (i.e., limited available cash) that makes a product with a custom molded enclosure. Inside the enclosure is a circuit board with three indicator LEDs, thus we have a clear window in the enclosure, see attached image. The current process for assembling the window is to put a small bead of solvent bond cement on the surface shown and then place the window into the opening. (For reference - the window is 0.50" dia by 0.19" thick.)

This process works and has minimal cost, but it is slow and messy. Can any of you suggest alternative approaches for assembling the window? Note that we do require a good seal between the window and the enclosure as we do plan to have the enclosures certified (ideally to IP67).

Thank you for your assistance!