Seal between fender & apron?

I haven't stripped out that many cars but the ones I did, didn't have anything at all.
When I bolted my fenders on, I installed a strip of closed-sell foam. I poked the bolts right thru it. That was 1999/~135,000 miles ago, and the 1968 fenders are still good there. She was my DD for many of those years.