Had nephew assist me to install this onto 6 polycarbonate panels for secondary glazing purposes. He unfortunately put the same polarity onto the second layer, which then did not work. After a little frustration he confessed his error an it was soon removed and rectified with out any residue left. They do stick well and after a while are a lot harder, if not nigh on impossible to remove. Does the job well and holds the panels into place. The adhesive is so good that after a day the panels were removed and the base layer stayed in place. On the odd occasion where the surface was a little suspect I stapled then into place, small pins could be used instead as there is a groove in the middle. Very please with the overall effect and the room is warmer and quieter this makes SWMBO happy so result all round. 30m was a bit excessive, but needed extra due to mistake.
Package weighs about 4-5kgs, and was delivered in a large jiffy type bag, with cellophane between each roll.
Only gripe, the backing is not easy to start to peel off and this took extra time.