Krylon Fusion says it's non toxic when dry right on the can. I looked on the Rustoleum website for any mention of it's suitability for our use. No mention of it, however I did find this:
Q Can I use high heat paint on the inside of the grill?
A No — just on the outside of the grill. The product does not have flame resistance and is not USDA accepted for surfaces that may come in contact with food.
Q Can I use Rust-Oleum paints for a swimming pool?
A No. These products are not suitable for continuous water immersion.
For $5 a can at Walmart and a track record of success with the Fusion, I wouldn't risk it personally. My .02