Let's talk about this! If applying Rust-Oleum Modern Masters Front Door Paint to bare metal, we do recommend priming the surface with a water-based primer. This will ensure full adhesion of the paint. Any loose paint can be removed via sanding or striping prior to priming and repainting the door. We recommend priming with Rust-Oleum Zinsser Bulls Eye 1-2-3 Water-Based Primer.
https://www.homedepot.com/p/Zinsser-Bulls-Eye-1-2-3-1-Gal-White-Water-Based-Interior-Exterior-Primer-and-Sealer-2001/100398391
- Rust-Oleum Product Support 3