Silver is going to take a few coats to cover. I have yet to see a colour, except black, that lets no light through. If you disagree, then another light to medium coat won't hurt. If it looks close in "texture", then do your "backer" coat, usually black. The silver will really pop once the backer is done. My usual philosophy is to use as little paint as possible to get my colour, and finish with a light final backer colour.
I learn a lesson with every body I have ever done. (30-40?)
My worst so far is a 1941 Willy Street Rod, in candy purple. It's a little light in some areas. I used a silver as a backer, followed by black as final. The silver pokes thru a little on the roof. Still love it to death, though.