The thing that tickles me is that the rest of the airrame allu went over the enamel beautifully.
The affected area lookd exactly like the rest of the airplane BEFORE I shot the pollished allu over the airframe allu.
SOmehow the pollished allu ate through the other alclads and enamel to foil the plastic.
I have in the meantime masked and sanded back the area, will re-black it and then try again.
Theuns