My CMC has the body glassed into the metal frame and is not easy to take off. I notice some of you guys are able to take off the body relatively easy and was curious how it screws in.
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When we "remove the body" on our CMC's, the entire assembly is removed - the body is bonded to the body frame so you really can't (or shouldn't) separate the two. It's the frame that mounts to the VW pan.....the body just goes along because the frame and body are one. There should be something like 16 bolts holding the body/frame to the pan.
The CMC build manual also calls for roughing up the inside edge of the fiberglass boday and the VW floor pan and running a 4-6" band of fiberglass cloth and resin. I'm sure that's what you are referring to. Its additional water sealing over the VW pan gasket and tubes of silicon caulk. See Figure 10 on page V-12 of the '84 build manual.
Seems like mine was welded all together
Welded can be ok, unless at some point in the future you want to remove the body for some reason, then you're stuck. Very, very few of us have ever separated the body from the pan once mounted, simply bacause there usually isn't any reason unless you wish to change the rear torsion bars.
If it's welded to the pan, live with it, BUT, inject silicon caulk along the seam, both inside and out, to seal it from water intrusion. You could also wait til it's dark, then put a bright light on the inside or outside of the body and scan along the seam to see if you can see light along the seam, and make sure you add more caulk along there.
Be especially liberal along the back seam, closest to the engine, as the rear wheels throw a lot of water at that seam and they often leak (Jack Crosby cured his VS of this with a couple of tubes of silicon he got from a neighborly "southern lady" who opted for less "fullness" in her boob job after she saw Mariah Carey........Or something like that.)