On the areas that were just surface rust, I just wire-wheeled the area to bare metal, used rust treatment and painted it. I also had a rusted out drain plug. I cut it out and welded a small plate in, treated it and painted. The areas that were on the seams were luckily just surface rust, so i wire wheeled them to bare metal, added a couple tack welds, then treated and painted. Luckily none of the seam spots were rusted through.
Not sure if it was the correct way, but that's what I did.
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