Gotta remember this is in Minnesota. If you listen carefully at night, you an hear cars rusting.
If you use POR 15, use gloves. You can’t get it off your hands or anything else once its on there. Buy the small kit that includes the metal prep and cleaner.
One of the cable channels had a program featuring Rat Rods and I recall one rusty old car that shined and the owner said he coated the body with boiled linseed oil to seal the rust. It seems to be somewhat of a natural clear coat. I might try it on some yard equipment and cover it with paint.