Experts and BHG readers answer.
Painting metal door
It will be pretty hard to remove the dents in a metal door but you can fill them in. We usually use what you would use to fix a dent in a car…BONDO, a fiberglass body filler. This stuff is like spackle for metal work. Mix some up..smooth it out…sand , prime and paint. That prime step will be important for the entire door repaint. Make sure you have a primer that is designed to be used on metal. I have always had better luck with oil based primers on metal. With the right primer you can use just about any topcoat including latex.