The headliner tack strip appears to just have glue on it. If the retainer needs to be removed, the clips must be extracted correctly or they will be ruined. POR(Paint Over Rust) is not the best method to stop rust, removal is. Bare, non galvy metal can be etch or epoxy primed and topcoated if you run your car, and it's not afraid to be exposed to water. The tracks should be left unpainted and treated as James did. There are other coatings besides POR if one must cheat. POR and Eastwood have targeted the hobbiest with little knowledge of the industry. Local jobbers have other products one can use. There's even POR's competitor which is Master Series. Permatex has a rust treatment, Mar-Hyde has One Step. SEM, which provides professional products to the industry has corrosion treatments.