Right, we're making our own sample boards for the new Polyflor EnCore* - sticking the planks to some blank sample boards they procured us. Here's the kicker... As acoustic foam is usually not stuck down, what in hell's name would best gluing it to the boards with? *very nice product!
We're trying out double sided tape now... The spray glue was "OK". Considered PS as that's what the chaps at Polyflor technical (after a little deliberating in the background suggested - along with the tape).