I've also found the same brands of paint work best together, so if you're planning on using Rustoleum for the layer above the silver, you may want to use Rustoleum for the silver as well. It's at least something to consider. I used the testors metallic chrome for a while, but other paint didn't like to go over top so I switched to Rustoleum (but a different one than you have there. Mine had a chrome-like metallic cap).