Why is this not METAL?? Scratches, bends, breaks if dropped of small wall, make it metal please....plastic is no good for this.. Good idea for making a perfect bed but come on their is no way any old Tom Dick or Harry can build a wall with this, with it being plastic it seems to bend & flex with the Suns heat mine was not straight had a right bend in it so the beds followed the bend in it.. Use less unless mega pressure was applied as for buttering joints lol that tool is way to hard to use & once again lots of pressure to stick the bed but falls off 70% of the time. With it being plastic it straches with the gobo. Only good for bog stranded brick too. Will only lay 1 way so in a corner you can't make the bed to the end as the trough gets in the way. Can't lay curves as its too long. Good idea but it's never going to make a unskilled DIYer build a wall bbq or extension. You'll end up with a leaning in even wall.