Enclosure for LCD Shield

I've got a couple outdoor applications in mind using the LCD shield from Nuelectronics. Does anybody have any good suggestions for enclosing this in a way that still gives access to the buttons while sealing out water?
I suppose that a plastic membrane keypad with a display would be ideal, but I don't know of any such products. As a BTW can membrane keypads be setup with a series of resistors in a voltage divider network to read multiple keys using a single analog input like the LCD shield uses?
Thanks for any suggestions.