Trunk floor looks pretty good, other than a lot of surface rust. I began grinding it al down to the bare metal with a wire wheel on a drill. Vacumed it all up & wiped it down with laqure thinner. Then applied several coats of rattle can primer. I think it will be ok. There where a few very small holes it the spare tire well. After getting it down to the metal & primering it I filled those with 3M seam sealer. Seems to have worked.