G'day
I've glued acoustic foam to concrete with liquid nails which lasted 20 years until the foam broke down. The plastic straws on the other hand, hmmm, nothin much sticks to shiny smooth plastic. Liquid nails might be worth a go. I have made a few floats using polystyrene foam and wall plug spaghetti, glued with hot melt. That worked ok
Cheers
Rod