I have sound proofing/deadening material up on my walls to help acoustics, but our cats like to eat it some times, and I can't imagine that's good for them.
Is there something we could make/get to spray on the foam that would deter the cats from eating it? They do this when no one is home/sleeping, etc. so we can't be there all the time to physically stop them.
Obviously taking the foam down off the walls is one option, but it would be nice to keep it up and stop them from eating it if at all possible.