I don't know how a product can take 400 degrees, then go down to 60, stick to powder coated metal and still be non toxic. I couldn't find it at any local store - of any kind. I needed this to plug some of the places where smoke might be leaking from a recently purchased smoker. It has very simple instructions, applies about the same as bathroom caulking and cleans up well if wiped off right away. It's been up and running for about a month now - still stable and working exactly as described.