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Alright progress! Following in the exact footsteps of @SNLC from the Troopy Hodgepodge thread, I had seen that they had cut into the floor to access the cross-members that support it underneath. I am SO GLAD I did. Nothing was horribly rotten or rusted through by any means, but another couple years down the line and it would've been a totally different story. Glad I got to this when I did.
Wire wheeled what I could, followed by sandblasting everything else, then rust converted, and finally covered it all with a rust encapsulator paint.
Ground down the backsides of the pieces I had cut out which had minimal rust on them, but still didn't want any chance for anything to grow, and slathered some weldthru primer on them.
To anyone who hasn't done this kind of tedious sheet metal welding before, I truly wish you never have to. At first glance, I figured this would take 4-6 hours tops... NOPE more like a day and a half (14 -16) hours. Every part of the cleaning process takes quite a significant amount of time, alongside the cutting and welding parts aswell.
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That Willy's I acquired was the same way! Sat at a house on Wrightsville Beach for the past 25 years or so, my buddy had seen it over the axles multiple times with saltwater whenever flooding would happen. Went to dive into the brake work and good lord... just getting the wheel cylinders out was a battle. I ended up having to angle grind 3 out of 4 of them in half so they would fall apart and out of the drum assembly.

I'm so stoked to finally be posting regularly on here again! It felt wrong not even opening up mud for months.
Massive thanks to everyone per usual for yall's concern for my safety and advice yall have to offer. Seriously it is invaluable to me.
Wire wheeled what I could, followed by sandblasting everything else, then rust converted, and finally covered it all with a rust encapsulator paint.
Ground down the backsides of the pieces I had cut out which had minimal rust on them, but still didn't want any chance for anything to grow, and slathered some weldthru primer on them.
To anyone who hasn't done this kind of tedious sheet metal welding before, I truly wish you never have to. At first glance, I figured this would take 4-6 hours tops... NOPE more like a day and a half (14 -16) hours. Every part of the cleaning process takes quite a significant amount of time, alongside the cutting and welding parts aswell.
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Thanks for the heads up on the media getting damp, I'm not running any water seperator at the moment. as well as the foam closed cell foam and where to grab it, keeping that in mind for way later in the process and the troopy is all back on the road. I don't know if there's anything to actually bolt to on the windshield frame parts I have received, that is my biggest worry however is keeping everything as straight and as factory as possible.Glad you're moving forward again. ....On the sandblasting only thing I've ever used is sand. Which if you're short on cash you can go to a local playground and get a small bucket from the sandbox. Biggest problem with a dirt cheap sandblast setup is the sand getting damp from moisture in the air and clogging. Dump your air tank very often if you don't have a good water seperator. ...I'm actually curious how much better blast media is for simple rust removal. gray closed cell foam 3/8-1/2" "fatique mat is a very good and not expensive sound deadening material for your floor. They sell it at lowes or home depot in the carpet area. It is used for mats on concrete floors in work areas so workers that stand all day have some relief from standing on a concrete floor. You can use the "vinyl upholstery spray paint" to color it to the desired color..............before you weld your windshield frame together you might try bolting it in the LC in pieces and then tacking it in proper pos., before welding it complete so it doesn't warp/shrink/deform enough to become difficult to bolt in........I had a similar LC brake loss experience when I was 20 at Clemson in my FJ40. You are a much more competent mechanic/fabricator than I was at that time. .....My 72' FJ 40 was from Folly beach and flooded with salt water during hurricane Hugo. My wheel cylinders kept getting frozen with rust so I had to clean them which required removing the rubber boots and cleaning them. rubber boots fell apart(brittle), Which then caused them to freeze up more often. One was so frozen I drilled a hole through the wheel cylinder in order to drive out the piston with a steel bolt and hammer. I then put the bolt in the drilled out hole with RTV to seal the cylinder again.........some weeks later I drove up into the mountains exploring some 2 hours from Clemson when it blew and my brakes went out completely........I drove it home turning the 2 hour trip into 5 utilizing low range downshifting and the Emergency brake..........YOU welding it up behind the parts store is above and beyond your years. Outstanding effort.!
Good luck-R.
That Willy's I acquired was the same way! Sat at a house on Wrightsville Beach for the past 25 years or so, my buddy had seen it over the axles multiple times with saltwater whenever flooding would happen. Went to dive into the brake work and good lord... just getting the wheel cylinders out was a battle. I ended up having to angle grind 3 out of 4 of them in half so they would fall apart and out of the drum assembly.
Rust Kutter this is the converter I'm using, seems to be one of the best preforming ones from the various videos I have watched on it and my local tractor supply had a gallon of it for sale for 1/2 off! KBS Cavity Wax is what I bought for the wax but will probably order what @jblueridge linked when I need to coat more as it seems you get much more bang for your buck. I'm using .024 hobart from tractor supply cause its what is closest and cheapest to me, I had .025 lincoln in it before but with a .001-.002 difference I feel like its really splitting hairs at that pointpost the rust converter and cavity wax you use! I am glad to see you back to tackling this. getting all the swiss cheese out of the troopy! I am going to do my drivers rocker soon once I get some warmer too. what size welding wire are you using out of curiosity. .023 I am pretty sure is what I used on the salt wagon.

I'm so stoked to finally be posting regularly on here again! It felt wrong not even opening up mud for months.
Even with the coal slag that I'm currently using, I saw a bunch of dust in the air while pouring it out of the bag into the blaster; that's my sign to grab a respirator! If I can see dust in the sunlight or if my throat starts feeling a little funny, I'm grabbing something for my lungs. The entire time I was welding today I was wearing a respirator as well, all of those fumes from the residual paint or weldthru primer burning off don't feel good in my throat. It's amazing to me how all of the guys (other than me) at my work don't wear any lung protection, there will be days where there is a thick fog in the shop of welding smoke/grinding dust (cause our ventilation system doesn't work) and my buddy Justin is over there smoking a cig while laying down some nasty stick welds for hours straight. Seriously appreciate your concern for my health.Be very, very careful using sand (I wouldn't recommend it at all). Sandblasting with actual sand creates extremely fine silica dust, which stays suspended in the air for a long time and is quite a health hazard if inhaled. Regardless, make sure you use a respirator while media blasting, and you'll probably find that a face shield and safety glasses are really nice to have too.
Very VERY good to know, I figured it was flammable to an extent but not that it was combustible. Regardless, the cavity wax will be all applied after the bodywork/paint job is complete. I also was not aware of the difference of a foam vs powder fire extinguisher, really good to know. I'm gonna go place an order for 2 right after I post this (one for the Willy and one for my temporary workshop) Last year when I exploded I inhaled a bunch of nasty smoke from when I was on fire and putting the fire out, but I vividly remember how my throat closed up when I had to spray myself with a powdered fire extinguisher in order to extinguish myself. Felt like I had a nasty coating of what I would imagine baking flour in my throat for a week or so, didn't matter how much water I would drink, not fun.Be very careful i.p. with the cavity wax.
Wax and welding is literally an explosive mixture.(Nobody knows better than you what that looks and feels like)
Remember that wax will melt and flow by induced heat from welding. It might suddenly show up in unexpected places.
Have a water hose and foam (!) fire extinguisher at hand at all times (don't use a powder extinguisher. Powder totals vehicles)
Also wax is very problematic when it comes to painting the rig.
Needless to say that creeping liquids like FluidFilm are even worse.
I strongly recommend to apply any wax / oil only after you are done with the bodywork.
Good Luck Ralf
Massive thanks to everyone per usual for yall's concern for my safety and advice yall have to offer. Seriously it is invaluable to me.