Thanks 64 convert. Your article is excellcent. A lot of time when into that article.
The installation does scare me a bit, obviously a lot of time went into it as well. It is something I will definitely do at some point in the future. Here in the south east air conditioning has become a necessity. Too much traffic and the temps this past summer set records regularly.

The expanding foam you get at your local big box depot will not absorb moisture. However you would want to make sure area is dry and clean as it could trap water/crud when it expands out.There are two kinds,one doesn't expand out as much.Either one will come out of places you didn't even know you had places I speak from "been there done that"working on a old pickumup truck

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83 B-150 slant 6,4 speed. 79 B-300 360 pathfinder 4x4. 74 W-300 318 4x4 git-r-done 80 B-100 sl6,4speed

If you can get access, get all the loose crap out (dirt, rust, etc) and line it as much as you can with fiberglass cloth and resin much as you would repair a Corvette or a boat. The important thing here is to saturate the cloth with the resin; slapping cloth on then dabbing the brush on it is gonna leave alot of dry cloth which isn't as strong. Cut the cloth (get the cloth instead of the mesh) in 1-1/2"ish wide strips by 4-6" long, dip the cloth into the resin, and smooth it with your fingers/a brush when you set it into where it is gonna wind up, and overlap the edges of each piece of cloth a bit. These "fret out" and fray so when they dry, they will lock together and it'll not leak, not draw in fumes from the previously open underside and be stronger than ever. and even if you show the car eventually, no one will see your repair. It will also seal the remaining steel so that it will not be exposed to any more moisture. The overlapping fibers is where the strength will come from. I have sealed floorpans this way that were basically solid but pin-holey, also the seams when Ive had to piece in floorboard patches. You wouldn't believe how much quieter it will be in the car, too. Kinda like laying in Dynamat, I guess. I was real surprised at what this did for the quietness when I did the floorpans in my old '78 D 300.

So, it would work? and not cause more problems? I miht do this.

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1963 Dodge Dart -225 Slant 6, 904, 2.76's, 18.84 @ 73
1970 Nova 12.53@108
1970 Bug 15.38@87

No money back on expanding foam idea I do know that if you end up not happy with the results it's a bogger getting it back out of hard to reach areas.Also you apply it with the can upside down and it squirts out through a straw/trigger.If you cann't get the straw where you need it with room for the can well that might sour the deal

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83 B-150 slant 6,4 speed. 79 B-300 360 pathfinder 4x4. 74 W-300 318 4x4 git-r-done 80 B-100 sl6,4speed

A couple of notes on long term use of the expanding foam. I have been using it for years. It WILL NOT repel water for any length of time. UV will killit in short order about 6 mos to a year here in Arkansas. Wasps like it for nest material. It doesnt accept paint or any kind of solvent, gas, etc.
My Experienced 02.
Frank

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered