

Painting Front Doors - Prep Help
Repainting my front doors. Started with sanding, while doing so the top coat is flaking off. It appears the top coat was a poorly applied water based paint. (I tested with rubbing alcohol and top coat did come off onto the rag)
The base is either just factory fiberglass (*edit - appears to be steel door. Some rust under the door sweep) finish, or maybe oil based? It doesn’t come off on the alcohol rag.
Original plan was to sand off whatever flakes, then prime with what I have which is Benjamin Moore Fresh Start Primer. Will this primer suffice? Or will I need a kilz or zin cover stain? Will be topping it with BM regal exterior. Thanks for the help!