Long story short. My base van here was a cargo hauler window van. It had a cage and long tracks for tying down cargo. These items were screwed to the floor using self drillers. I have about 170 1/4" holes in the floor of the van and I gotta plug em or the floor will rot away.
Welding? Probably best as it would restore structural integrity. There are areas over the tank I simply cannot weld unless I drop it out. Which I might.
Seam sealer?? It's an option and maybe for some hard to get to holes where I can't get a backer up to it for proper welding. I could Smooth the stuff over the holes and shape to the floor, then go underneath and spread the squeeze through to make a tight seal on both sides. No restoring any structural here.
Panel Adhesive?? My buddy suggested 3M 08115, which is a body panel adhesive which supposedly is as strong as welding. I could cut some strips of sheet metal and epoxy them to the underside. Might get me some structural integrity back too and would certainly seal up the holes.
I want to get after it this weekend, so I may order up the sealer and epoxy anyway.
Any insights are greatly appreciated. Here's the mess: