I use a lot of cold galvanizing on my projects that may rust, or have rusted.
It is available in spray cans at your local hardware/home improvement stores. I liked the older stuff, the last can I got resulted in a sparkly glossy finish where the older seemed to deposit nearly pure zinc.
No doubt the older style was too hazardous for us mere consumers...
Formerly: 2000 Four Winds 26Q/Ford, '96 Kit Sportsmaster 22' 5th wheel, '91 Sunlite truck camper, Wildernest flip-top canopy