Very handy, easy to use

Some of these pieces never "decompress", which means they remain flat. The glue on some panels seems less "sticky" than others and has come loose from the surface to which they were attached. The consistency of the quality is clearly something that can be improved. Panels that decompress and have good glue seem to work well. 80% of the pieces were great.

There were several panels out of the 24 that were shattered on one side and have never fully recovered, but I actually only needed 21 panels to cover my 36-inch door, and 3 were trimmed, so they could lose a bad edge. It's best to order a few more than you need, if possible, to avoid having to use a damaged panel (apparently damaged by the extreme vacuum packaging, causing permanent distortion). I cleaned the door before applying to ensure there was no dust on it, took the time, and repositioned the panels as needed to leave no gaps, and they have stayed perfectly in place. I cut the contours as needed with a simple pair of scissors and used the back as a base to draw contours. The glue was suitable, not too sticky or too little, but sticky enough that it was a bit difficult to remove for repositioning, but it didn't lose that stickiness, and with a little stretching, you could also stretch the gaps a bit; gaps that occur if you don't pay attention to alignment during application, both vertically and horizontally, while working row by row. I do hope it produces a little less sound that reaches the other side of the door, although the usual sound wavelengths are much longer than the thickness of this foam, so it has little chance of holding them. A middle C tone has a wavelength of 1.3 meters. Most sound will probably just pass through it. Its real function in acoustic applications is to reduce sound reflection from flat ceilings and walls; wooden or tiled floors also require carpet to do the same. You need A LOT of it to make a big (and noticeable) difference in a room, the more the better if you want a theater environment. I would probably do all the walls in that hallway that.

Unfortunately, about half of the 48 panels have a poor adhesive layer. Very strange, and also a pity. The rest stick perfectly and the shape is also good after unfolding. Credit has been received, which is nice. We bought an extra set that sticks better (different brand)