Correct! And if you keep reading, "Rust-Block is used to prevent rust for up to a year if you do not have time to paint. I thought we all understood that cleaned metal must be painted.
here is the copy paste from EvapoRust. Now its time to go play, I think this horse has been beat.
PREVENT RUST DURING STORAGE
Now, let’s say you’re in the middle of a project, and you need to step away for a few weeks. For example, you want to store your lovingly restored 1967 Ford Mustang over the winter. You don’t want to come out to your car to see rusty rotors. What should you do?
IF YOU DON'T HAVE TIME TO PAINT OR PRIME, use it to prevent rusting for up to 12 months until you have time to continue with your project. When you’re ready to paint, simply rinse with warm water and dry thoroughly. It’s easy to remove and will not cause problems with paint adhering to the metal.
Spray the rotors with Rust-Block. It’s safe to use on all metals, and it will prevent rusting. When you come back in the spring, your car will look the same as when you stored it.