Odd, I've used sticky back in a car once to repair something and it never gave me any trouble or came loose and that was definitely in the heat, I'll see how it holds up over time on the camera. I tried pulling the velcro loose from camera and it appears to be a pretty good bond, it's some kind of glue, very good stuff.
Yes, I masked off the unused part of filter with velcro same as the Z10k. On TD10 it's sticks at top and bottom and then I have a long wrap that goes 3/4" around it to help hold it in place and also keep dust, dirt, sun out of the filter area. But having the glass on was intentional that way it also provides UV protection without the other filters on.
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