[b-man]

My Tempest had a much worse surface rust problem on the trunk floor.

I wire brushed it until I couldn’t remove any more rust then used POR-15 silver that has aluminum solids to help fill pitting.

Something like Rust Encapsulator after wire brushing (use the small stainless brushes the size of a large toothbrush) should do the trick here.

Then topcoat using whatever spray paint you need to match the color.

I had the same issue with my Saddle Bronze Le Mans convertible but even worse than the Tempest. I patched a few small holes with fiberglass cloth and the same silver POR-15, later put a coat of semigloss black POR-15 over the silver. A reproduction trunk mat hides everything, I didn’t bother painting body color over the POR-15.