Rust NEVER Sleeps!
As you are tearing down your GT - I presume in preparation for painting - that rust has to be dealt with while you have the opourtunity.
Left alone it will eat its way through to the outside and ruin any new paint job in an area the most Mustangs see - the tail end!
Seriously, at the very least scratch out all the loose flakes and heaviily coat the area with POR-15 to slow things down. Removing the rear panel is not that bad a job and it can be reoved in sections - see the "action" pics in my gallery.
As you are tearing down your GT - I presume in preparation for painting - that rust has to be dealt with while you have the opourtunity.
Left alone it will eat its way through to the outside and ruin any new paint job in an area the most Mustangs see - the tail end!
Seriously, at the very least scratch out all the loose flakes and heaviily coat the area with POR-15 to slow things down. Removing the rear panel is not that bad a job and it can be reoved in sections - see the "action" pics in my gallery.