Time for some body work...
It's 3M Brushable Seam Sealer. https://www.3m.com/3M/en_US/p/d/b40067208/Like most of their products, expensive but worth it. Use in a well-ventilated area, those solvent vapors are strong!
The problem with just using flat sheet metal in places that had stamped ribs is that it's more flexible. I figured Ford put those ribs in for a reason and I should keep them
Fortunately, Carolina Classics has good ones (original heavy-gauge).
I still need to make and replace a rusted inner fender bracket (same place as the other side was), and sand some smaller areas before I can undercoat/paint the fenders. Fortunately the rest of the floor just had some (relatively) light surface rust, so I may apply Ospho and hose it off after 30 min or so. Considering POR-15 vs. good old Rustoleum prime & paint...
Will post pics tomorrow, I didn't take any today and I'm too tired now
This is the floor pan section sitting in place, after drilling for plug welds and applying Weld-Thru to the underside. No point in priming/painting the topside yet, it'll just burn around the plug welds

I also drilled (8) 5/16" holes for plug welds in the cab mount vertical flanges. Next session, I'll weld it in, then weld the floor pan to it.
I've done some reading and there is a lot of discussion and very little consensus as to whether one may use Ospho before POR-15. I'm considering just putting the POR-15 on the floor after sanding with 40 grit discs. It is supposed to adhere well to the "tooth" that rust or coarse sanding scratches give.
And this section is under and behind the seat...
I put four plug welds in the forward flange of the cab mount. The other four are going to have to be done underneath with my clumsy left hand, just like the left side was. Meanwhile it's sitting on the bushing until I drill the through-hole in the mount and install the bolt.
This was fun to cut out and patch!
Radiator support nearly detached on this side, too.
A closeup to remind me where to put the mounting hole once new metal is welded in
Patched and sealed, ready to prime and paint
The finished repair. I may undercoat the part that's exposed in the wheel well.
The repair after seam sealer/prime/paint. Now I have to do the rest of the floor... or get carpet
At least I'll bead-blast and paint the battery compartment door.Next session I should be putting the inner fender, outer fender and door back on!
A real storm with high winds and about 2" of rain went through while I was out there. It's LOUD in a 30x40' building with a tin roof! Figured I might as well keep working since I'd get soaked running for the house anyhow...
I also remounted the door. Got lucky with the alignment so I wasn't jigging it this way and jogging it that way for an hour this time! Also bolted up the inner fender.
Then I had to stop to bead-blast, prime and spray paint the battery compartment cover and all the little brackets that hold various devices to the inner fender. Finally I glued the new weatherstrip to the outer fender, lifted it into place... and decided I'd had enough for one day. Five hours of continuous work just wears me out any more.
I got the outer fender installed and lined up, drilled the hole in the new cab mount for the through-bolt and donut pad, changed the oil (black as midnight but not sludgy) and filter, put the wheel back on and set the truck on the ground. I decided to wait until tomorrow to paint over the primer on the cab floor, although it feels cured to my fingertips.Now the waiting game starts - when will the upholstery shop start on my seat, and how long will it take him...
Found the other half of the steering column/firewall seal plate, half of which was rust. So I welded in some .032 steel, primed and painted it. Re-mounted the a/c receiver dryer, heater hose bracket, and horn relay to the right inner fender.
Also collected all the rust and steel fragments from each side. It's quite a pile. Installation was not the reverse of disassembly

Left side:
Right side:
Ford Trucks for Ford Truck Enthusiasts
The seat does look nice but it's already getting dog hair (despite a shipping blanket) and lumber mill mud on the new carpet. Oh well, it's a working truck not a show winner!







