Looks like maybe it's been reformulated.

http://findarticles.com/p/articles/mi_m3092/is_7_38/ai_54397909/

I think they [used to?] use propane or butane as the "inflation" gas.

I do know that my ususal tire shop has a sign up that says they will not
work on tires that have Fix-A-Flat in them.

Allan
--
1991 Vanagon GL

On Fri, 17 Apr 2009 07:23 -0700, "Don Hanson" <dhanson928@GMAIL.COM> wrote:

> Yeah, I never heard the "explosive-flamable..blow up workers..burn up
> workers" allegation either.  I don't see how the Feds would let something
> like that be widely sold.  If you had a blowout with Fix a Flat (and I am
> sure many of these have occured) wouldn't the wheel rim, sparking  on the
> pavement' cause a big explosion if indeed it was highly flamable? Never
> heard of any 'grenading flat tire" incidents, either.   It is messy. I've
> never had a tire changer turn down the work of changing a tire because of
> it
> though...and I tell em up front about any tire I've used that stuff in.
>   Don Hanson
>
> On Thu, Apr 16, 2009 at 11:16 PM, Rob <becida@comcast.net> wrote:
>
> > 5 years at a front end shop and I've dealt with a lot's of fix-a-flat
> > tires. Never had one blow up, never even heard that story before but
> > that crap is messy to deal with.
> >
> > Rob
> > becida@comcast.net
> >
> >
> > At  4/16/2009 05:27 PM, Allan Streib wrote:
> >
> > The problem with Fix-A-Flat and similar products is that some tire shops
> >> will refuse to touch your wheels because the stuff is explosively
> >> flamable and tire shop techs have been seriously injured removing tires
> >> that are full of Fix-A-Flat.
> >>
> >> Allan
> >>
> >