With that particular dent I posted a photo on in post #34 above It happened when I put the ThunderPower sticker on there.
There was an airbubble and I was trying to press that out gently at the edge with a soft Topz cutton swab.
The Surface on Galactika wings and stabs are rather soft, it is very easy to get dents.

And I was thinking for future also as I get more dents - I do not want to have a more and more decal covered plane as times goes

I can not remember I have had any plane before that has such fragile surface as my Galactika wing, stab, rudder.
I have build planes before (free flight, control-line and RC) that was covered with Japaneese tissue (probably Galacticka is also covered with similar material under the paint) and it has not been as fragile as my Galactika (what I can remember).

Of course I will be very careful when I handle my Galactika to try to avoid dents but there will always be "hangar rash" and on this plane easier then I'm used to. Oracover/Ultracote plastic film covered wings etc is more durable and smaller dents is usually just to take the iron and tighten the film over the dent and it is in most cases then invisible.

/Bo