Cowl rust

I've been prepping my 75 for paint and had pulled off the cowl several weeks ago, sanded the top up to 600 grit, but didn't really pay close attention to the underside. Yesterday took a close look and found (surprise, surprise) a ton of surface rust, there are 2 ?vinyl pads on it and were full of rust underneath, so today I will be treating that panel for the rust. This is just an FYI for yet another spot to check for rust on a Z.