I don't think it is possible. When the card is cut the silver coat is ruptured and reveals the white paper core inside. If you use the paper dust method described in the thread above you will only soften the edges, so-to-speak, but not hide the seam. In addition, the glue would make the surface dull which is not desired.
As for making "silver dust", this is not possible. I don't know what this coat is made of but it seems that it consists of real metal particles. These wouldn't connect to each other in the described process.
I'm thinking of using Revell acrylics instead, Aluminium should do (silver is not very user-friendly). It should be able to mask the seam a bit. ASC used a silver pen to paint his model, I think this is another possible way. Anyway, I kept this in mind when I was designing the model. If you take a look at the plans you will notice that nearly all seams are covered by other parts, the strips and rivets, exactly like on the real prop. Everything else which remains visible was visible on the real one, so this model should be exact to the seam, if you may say so.
:twisted:
BTW, I'm assembling the arms right now and have got an idea for the Maximilian figure from "The Black Hole" which is on my list. The nail I used on Crichton's wrist could be used as a basis for the rotating blades on Max's arm (those used for killing the Palomino crew member). If it works you'll be able to actually let the blades spin..!