T25 rust attack - driver's footwell

Since buying the van earlier in the year I haven't had chance to pull up the mats properly and find out what was underneath a think layer of wax protector. Well... below you have it.

The floor has been replaced sometime, but I don't understand why the metal wasn't undercoated - only protected by the wax. hence it went rusty. I've sanded it back .

 Look what I found. A couple of holes near the accelerator pedal. I will need to patch these up!

Look what I found. A couple of holes near the accelerator pedal. I will need to patch these up!

 After cleaning it up and wiping it down with turps, I added  Hamorite Krust . It claims to turn any rust into a clean surface 'after 15 minutes'. It converts iron oxide into stable iron composites.

After cleaning it up and wiping it down with turps, I added Hamorite Krust. It claims to turn any rust into a clean surface 'after 15 minutes'. It converts iron oxide into stable iron composites.