67ramairowner, my friend Bill did use it on the roof under his headliner, and it really stuck well. He did not use it in the doors. At the time, I asked him, and he just said he didn't feel the need. His car had O rust and is a dry CA car he's had since 1977. The factory stuff sprayed on the inside of his doors was still fine. If it were me, I'd probably roll some Frost King or whatever in the doors and quarter panels when the glass was out. The stuff is not very heavy, and seems to really "tighten up" the car. Beware of some stuff, though. I went to an autobody class a couple of years ago, and the instructor told us of an old car (I think it was a Packard) that was destroyed by the guy shooting that yellow expanding foam into the rockers and a-pillars, etc. The stuff turned out to be acidic and a water-absorber, and his car rusted out everywhere within a couple of years and was not repairable.....but it sure was quiet for a short time!!
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Jeff 
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