Mk3 Spitfire Question

[Alex Cherington <a_flying_scotsman@yahoo.com>]

I have a 1970 Mk3 Spitfire and there is some corrosion
coming through at the bottom corner of the rear wing
just behind the rear wheel.

The wing to valance join appears to be covered with
some kind of finisher.

My question is how is this finisher held on? I would
like to remove it to repair the rust damage. Also will
the finisher be reuseable or will I need a new one?

Thanks