[DeTomaso] Subject: Re: Radiator Filler/Expansion Tank ?

[JDeRyke at aol.com]

In a message dated 6/19/08 6:20:07 AM, garypighetti at gmail.com writes:
snip.....
> A convenient aerosol that dispenses a one part, liquid urethane foam which 
> expands 200 to 300% and cures to a durable, hard foam, insulating sealant. 
> Fills large cracks and holes that caulk cannot. Forms an airtight, water 
> resistant and weather resistant bond on surfaces such as masonry, wood,
> metal, glass, tile and most plastics. Helps eliminate energy escape. 
> prevents the entrance of insects or rodents. Dries tack-free in 15 to 30 minutes and 
> cures completely in 8 to 24 hours, depending on humidity. Easy to apply. 
> Conforms to any shape.
> 
History Alert: Do NOT spray polyurethane foam inside any cavity in a steel 
car- even with one side open as on a door skin! Regardless of the sales pitch, 
urethane foam only cures about 99% in the first 24 hrs; in the next month or so 
you get post-cure shrinkage, which puts a tension on the foam layer. This 
opens up microcracks where water gets in, and then it does what water always 
does- it rusts! Back in the '70s, a few guys tried urethane foam in the main 
subframe tubes of Panteras to 'seal them up'. Several cars had the bottoms of the 
frame rails rust completely through in a few years, and at least one CA car had 
the rails cut open, scraped clean and new rail bottoms welded. The welder had 
to wear an air-breather hood under his mask due to fumes from burning 
urethane left from the scraping. This was un-cheap to fix. Mangustas had a 
factory-installed foam layer inside the doors to silence it; the foam held water against 
the door skin and most 'Gooses rust through the doors- from the inside-out. 
Not advised- J DeRyke



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