From my experience, you don't need to clearcoat the whole VF-27. Only the lavender detail from the nosecone to prevent scratches when transforming it. All the markings adhere just fine to the plane, I have not suffered any issues after numerous transformations.
The really important step to avoid touching the nosecone with the chest is to keep the nosecone folded but also SLIDED down when you transform it.
I had to touch up the nosecone with a mix of white, blue and red paints to match the lavender because I transformed it wrong the first time. After that I used Glo-cot (the argentine version of Future, done by Johnson&Son) and it's holding up really well. The Glo-cot is shinier but it's hardly noticeable.
Do you still have the same address you pm'd me last year? Cause I finnally found 1/72 Alto's decals so I'm gonna mail them to you.