There are really no proofs for the clearcoat...but lots against it:
-Why should Gino paint his own helmets wrong if he is working for EFX and has handled lots of Originalprops?
-Why is the ROTJ Reveal not sprayed with clearcoat?(saw it in person)
I find it amusing that you're stating with such authority that there was no clear coat based on casual observation, but in lieu of your own responsibility to provide evidence, you're depending on Gino who has not provided any evidence at all. You've also, twice, appear to have decided not to pop over to The Prop Den to examine both sides of the argument and to be more informed. Or are discussions and debates won because one has a stronger opinion than someone else?
If you had examined The Prop Den thread in which Gino at the time stated his belief that polished paint was used, you will also notice the year he made such posts. It significantly predated his time working for eFX. At the time, he had no access to the Archives. So to suggest his working for eFX now guarantees you that all his information is correct is, at best, presumption, because much of his viewpoints have been shared publicly on the Den and RPF that predate eFX by several years. I think you need to consider the historical context of what he shared.
Year back, when he stated his belief that they hand-polished paint and didn't do a gloss coat as well, he didn't mention anything about the possibility of a partial polish that retains orange peeling - that is a more recent argument. Back then, his proof of the polished paint theory was nothing directly from Lucasfilm, but his own hand polishing experiment done to a Jeff ROTJ helmet.
You will notice, however, that despite its obvious beauty, Gino's paint appearance differs from some scenes in ESB where you will notice reflection fuzziness as Vader turns his head. You might not pick this up from still shots alone. Look more closely at video footage and you may see two observable phenomenon: there are some brighter reflections on the screen used that seem to have sharper boundaries, and some darker reflections that somehow appear fuzzy. This might be accounted for an orange-peeled base layer reflecting in tandem with a more even-surfaced gloss coat. And might the gloss coat itself have received further polishing? None of us were on the set at the time to know for certain.
While I remain open Gino's notion of polishing to where orange peeling is retained, that does not explain why some brighter reflections don't show orange peeling. Again, I'm open, but I don't see it as of yet, but hopefully some evidence will surface.
May I suggest just simply remaining open to both sides of the topic until something truly conclusive comes to fruition? Standing on someone else's laurels does not constructively contribute to the discussion, and making drastic statements like there is no evidence of gloss on your Post #484 (I see you've removed your comment) - in particular the helmet in the upper left, which is an ESB Stunt, perhaps this screenshot of an ESB Stunt will convice you otherwise.
The existence of gloss, yes, does not mean its evidence of hand polishing any more than it indicates evidence of a gloss coat. The ability to polish something to a shine does not automatically mean it was done on the screen-used props. Lastly, paint formulations improve with time due to advances in technology, so we have to ensure current-era information applies appropriately to past era paint.
Thus, let's focus on trying to add to the topic rather than to leverage someone else's opinion in lieu of evidence, otherwise we're at a conversational stalemate and needlessly rehashing a topic discussed to death on The Prop Den several years ago.
In all seriousness though, this is the Replica Prop Forum and its the place for this sort of details to be discussed by those of us who obsess over such details. I respect your opinion and indeed understand it, as there are other props I am not as passionate about and wouldn't really care for such a level of accuracy as long as I have a decent representation of the original. However for some of us Vader props ( more importantly the helmets) are the mother of all rabbit holes 
