Believe me... when you get into that rust it will grow.
you will find on the backside that it will be all the way around that wheel well on the inside.
In the future you will have patches on the front,, patches on the rear Quarters, they will bubble back up in a few years,
bit the bullet. Replace the whole panel, with the joint being under the moulding strip.
You all know I make them in Glass, (any size can be pulled from mould,)
Ron T. has proven how good they are buy hitting a Dock last year! and all his 30 mph splashes.
Dave and Hugh make them in steel.
I can make many body parts in steel too, but they already make a good one of these.
GORD S.