Basically the corner of her driverside floor board is gone, also with rocker panel and a hole below her window edge. Can we patch with fiberglass and goop some paint on. Nobody is going to see it. yes no?

 

it won;t last and will seal you problem in further. you would be better off cutting out the bad rust and patching in some panels. that is the more permanite way. if you don;t want a real fix you could just slap that stuff in there and forget about it for a year or two untill the rust eats around you patch job.