I checked that site Hutch and from what I read they are talking about using a hardener with their finish so I'm thinking you would need a spray gun to use it. They do have a ton of finishes I'll say that.
Yes it looks like you would need a spay gun. But they sell a Spray gun kit that runs off of a propellent. I think it is like $30 dollars. Which is reusable. It does work and it works well.