I dont recommend using the compressed air to spray towards your cat, it isn't safe and it should ONLY be used for cleaning out computer accessories. My cat doesn't even bother with my fish, when we got Kudo's 10 gallon, Milo came up and looked at it then decided he couldn't be bothered with it and hasn't even looked Kudo's way since. BUT in reference to "Betta proofing" your cat, when my cats are either scratching the furniture or on something they shouldn't be we spray them with a water bottle. They learn VERY quickly that way, though my one cat Smokie she just learned to withstand it LOL.
If you always do what you've always done, then you'll always get what you've always got.