Battery tray repair

Remember how bad the area below the battery looked like?

 I cleaned all the dirt out, removed the surface rust and the old body sealer from the seam:

then applied FERTAN as a rust imhibitor:

followed by some white Hamerite:

afterwards re-sealed the seam:

 ...and finally added a few coats of 2K-paint Porsche L90E Alpinweiß:

The direct before / after comparison: