dm41 waterproofing

[nsg]

I got my dm41 in the mail and been playing with it for a while.

One thing got me thinking. The front surface looks all smooth and waterproof. The back is not waterproof because of usb cut and reset pin holes. How hard it is to produce a case variant without those holes? Even without holes the water can get through screw threads and through the gap between front and case, but I could apply some product to those areas to keep the water out when I take it on a boat.

Anyway, with the case the way it is, what is the good way to plug those holes?