OK guys!! After a lot of time, at least I could collect the pictures taken in last 2 months, and follow this step by step. The progress is not too much, but consider that I were working in the Kai, also I'm still working in the VF-0S Battroid.
The first is sanding. Here is my sands. The sand branded "BS" is a sanding foam, very useful to sand curve sections.
This is the aspect of the frontal lasers. Not so beatiful if you watch it closely! So I decided to cut off. But as Noyhauser said, cutting resin with Dremel is a mess. So I bought a jewerly saw, and now I see that this is a far better way.
Now I apply epoxy putty: