I'm not sure what the technical term for these is but I have double glazed windows which have those white plastic bars which go across horizontally to make it look like it's 3 small panes of glass rather than one big one. In the past few months three of the bars have fallen off various windows.
Now, with lots of time on my hands, I'm thinking about trying to stick them back on. It looks like they were originally stuck on with some kind of heavy duty double sided tape but a quick Google hasn't brought up an answer to what this is called or where I can buy it. Does anyone have any suggestions?