Rusted out about a fist sized hole, wondering what best way to fix this is. Its not just on the flat part under the tray, it goes an inch or two up the sheet metal toward the fender. Thinking maybe fiberglass.....
the best way is to get a repro panel, cu tout the old metal, and weld in the new. next best way it to cut out the old metal, and fab a new panel to replace it. fiberglass is not bad only if you clean the rusted area and use por-15 to seal it.