Rust Repair 85 300D

[rmmagow]

My rust free 300D ain't. The rubber grommet for the antenna had long been kaput on this car . I am developing a hole at the rear bottom of the car as a result of this long neglected leak. Should I bite the bullet and have this professionally repaired or can I cut out the bad section, POR-15 the area and use a fiberglass based repair method. I don't know how to weld nor do I have a welding machine.
This is the only area that seems to be having any problems at all. I want to nip it before it creeps into the visible part of the car. Right now, you can only see it if you look for it. The other side is solid with no evidence of any upcoming issues. The only other section needing attention is the front, under the bumper. Years of road debris have sort of sand-blasted this area and a good sanding, rust primer and paint would save it. I intend to keep this car forever. I'm 61, forever won't be too long :-)