Drip Rail Reseal

[Stocker]

My old stuff was breaking up and I was pulling chunks out of the drip rail so it's time to fix it. Never done this before so I read through some old threads. Good news is there's only light surface rust underneath and it's nearly all wire-brushed out now.

I'll spray with NAPA Permatex rust treatment #765-1671 first, but I'm not sure what to do next. I had figured on painting, then applying seam sealer, then painting over that. Or should I skip the first coat of paint and apply seam sealer directly over the rust treatment, and then paint?

Thanks, guys. Old man here but a rookie when it comes to stuff like this.