In the building process of my KF IV-project I now opened the wing-crates, only to discover that the two attach-points of the right wing are somewhat rusty.
It seemes very thin, but I don't like rust - specially op that spot.
What shall I do? Any comment highly appreciated
That really looks like nothing. Buff it off with a scotchbrite pad and spray some primer over it. A rust inhibiting zinc chromate or epoxy primer would be best.
If you can't not reach for it, if it is in surface you might use C.L.R. rust remover, rince, and appy aluminium Corrostop paint over it, this paint will not husk if scratch.