The can states to keep away from children and pets. It is hard to say how it will affect every pet, if you have concerns it would be best to speak with your vet.
The coverage area is about 11.674 square feet per can.
No, it is not permanent as it will flake off.
Check the websites for your store location.
Hi Steph, I believe it would be best to reach out to the manufacturer, Chase Products for assistance. I have linked their website below with their contact information page so that you may receive the best details from their specialists. Hope this helps! We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot! http://www.chaseproducts.com/contact.cfm
It's not recommended being used around cats.
The snow should adhere to the wood and since the wood is porous it should go on pretty well. However, I really doubt that it will stay adered very well. Since it is an old piece of wood that you can throw away you could experiment. I would never spray this snow on anything porous that I wanted to keep.
It really depends on how much or how thick you plan to spray.