Front left-hand section, showing heavy corrosion adjacent to the sill, but plenty of Waxoyl and no corrosion above and to the front of it showing the Waxoyl did not penetrate between the panels:
The adjacent sill section, fortunately in very good condition:
The repair panels are considerably bigger than the amount I have cut off the old panel, only cut out the minimum to get to sound metal. The higher you go, the more work you will have to do to make the join invisible.