Interesting pmillen. Can this be used as an everyday kind of spray, or is cost something to limit on how often to use it? Looks and sounds great.
Everyday–There are some things, like baked goods, where it may not be the best choice. Typical sprays are tasteless Canola oil. Duck fat has a taste. (There's no such thing as a Canola bean. The actual source is rapeseed, but that makes a poor product name. It was named by the Rapeseed Association of Canada.)
Cost–I don't know the costs of typical sprays or this Duck Fat. I suspect that the Duck Fat spray is considerably more costly.