Rustoleum nooooo
I've experimented with the big rattle can primers, but they really aren't meant for models or small projects like customizing valks. The tooth is just way too course for the small pieces. -real rough. Even if you sand after spraying, the outcome won't be as nice if you use a fine surface primer. I use tamiya fine surface primer. Can't go wrong with it and it comes in grey and white. I still run some steel wool over parts after priming with this primer, and the surface is ultra smooth afterward. But not too smooth, because the paint still needs some tooth to hold on to. I say, if you're going to put some good time and spend a little money on this project, might as well do it right. As far as colors, try mixing your own colors to get that trully custom look. I rarely use colors straight out of the bottle. Take the original low vis valk(or see the review here at MW) and start with a mid-gray and then mix a little blue in, or light green, or both until you get the desired shade and mix in some grey with white to get a lighter grey. Have fun and be sure to post some pics for us when you're done!
AL11