I don't thing so. MANY props (as we all know) had the stuff you refer to (5' Falcon had a lot) and with amatuer photography, the flash bounces it back extremely harsh. It pops. Maybe what you're seeing is simply the effect of a short blast of punctuated white light from the camera flash.
There ARE definitely strips of silver paint or silver tape on the model, however. Mostly on the quadrant to the left of the dish.
Without contradicting myself: If I may be so bold as to suggest that this was sprayed both with,and without a backing colour. I may be new here,but I used to be an art student,so from what I know of contrast,and lighting conditions - maybe there are some places that aren't simply sprayed over an undercoat,but directly over it. There are definately darker shades,and overtones to this,so it may be decieving to the eye just exactly where those spots are.
There are many thoughts as to what was,but as I said before - we need to look past what we think might be there,and see what we most likely not expect! This was made in the seventies,but done by former art students,and teachers,as well as model makers. There were many different factors,and contributing members of this project to make what the script called for that was available to make this all possible.
There might have been last minute changes,or even damage that needed to be covered up,or there may even have been paint mismatches that happened as supplies ran out. There was more than one person working on this project,so all we can do is speculate from a modelers' view what circumstances surround this to make it what it is today.
This is an enormous undertaking that most of us wouldn't even attempt Rob! What you are doing is truly a first anywhere since the 1975 - 1977 era! Just take your time - this
IS your masterpiece,and just one moment of distraction,or indiscretion can bring it all crashing down!
After all the posts I've read there are few that I consider noteworthy of following through on. There are a lot of talented people trying to lend you their best advice,which I highly commend. But,without actually doing this like Davey Jones did - these are all just ideas that have yet to be applied.
Trust you instincts Rob - do this very carefully,and proceed just the way you've planned. You've come this far,and I know that you can do it from what I've read so far. We're all smiling on you,as you've done this forum proud,and doing ILM a true tribute to their vision.