I've seen some behind the scenes photos with people using this black putty to attach rectangular filter to round lens fronts and so on. Below is a photo of a MoVI rigged onto a car and spotted that there's a guy applying the same putty to attach the black thingie on top of a Anton/Bauer battery. - What is this putty? Fun-tak? Silly putty? Thinking putty? Play-doh?? photo source: http://machouseproductions.com/mythbusters-movi-drifting/ How do you use it? How does it perform in cold or heat? Some products seem to go back in to the "original" form like dough when others will harden in time and some are also magnetic. I'd just want to have sticky dough that attaches the filters in special occasions (plus magnets around cameras and cables is not so good idea). Any comments are welcome! - Tuomas