as others have said, duster turned upside down works too - but then again - if you're going to buy duster, you might as well use this stuff and use it rightside up.
But there are much cooler things you can do with it than freeze rusty parts.
For example, you can freeze flies with it.
It'll freeze them solid.
A few minutes later, they'll thaw out and start moving - they'll be flying again within 5 minutes.