horizontal.. like a sandwich. If you glue two sheets of foam together as if they were naturally laying atop each other, the seam will not come apart. if it is vertical (end to end) the stress of sitting, getting up, and moving about on the cushion will eventually pull them apart.@hellosailor : can you please explain what you mean by horizontal vs vertical seam?
you need what we used to call in the construction industry a board stretcherLooking for a good adhesive for sticking together pieces of foam.
A sheet of foam was cut up for the cushions. And, a couple of pieces need to be put together to make a whole. Is there something like a 4200 but for foam to foam?