I've done this before. If you want it to last you do what you gotta do.
Originally Posted by prestongroup
I would patch any holes in that area with metal. If you don't want to weld you can use body panel adhesive. Repairs made with the adhesive are very corrosion resistant at the seam.
I wouldn't fill in the channel if it provides any sort of drainage. Blocking drainage will make rust problems come back tenfold. I would put seam sealer over the seam after cleaning it and prepping it. I've pried those damn seams open before, cleaning and acid scrubbing them, and hammered them back shut with body panel adhesive inside the seam. This type of repair will stave off rust for a long, long time, because no moisture will be able to get under the seam.
You are the one you've been waiting for.