Seam sealer. How to apply and recommended brands?

[custom10nut]

So I was away from home for a month, while my truck sat at home. I got in pumped the gas and hit the key...... She fired right up
As I pull out of the driveway, I got a FLOOD of cold water pour out of the glove box and onto my feet/legs. Not cool
Ok, so I have a leak in my drip rail
I start this thread to get tips, I site, and suggestions on how to use Seam Sealer on the Drip Rail around the top of the cab.
I know I need to clean out the old sealer and clean up the metal, but that's where my memory gets fuzzy.

1. Do I clean, then prime, then seal, then prime again, then paint?
Or
2. Do I clean, then seal, then prime, then paint?
Also does it come with complete instructions for application?
Thanks in advance