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In a message dated 9/12/01 9:45:45 PM, you wrote:

<<Is there a reason to start using MC; given its serious environmental and
health effects?>>

Methylene Chloride is a superior solvent to acetone.  I ran qualitative tests
when I worked in a chem lab in which I smeared a little grease on several
small copper plates.  I then squirted each one with isopropyl alcohol,
acetone, and MC (no rubbing).  The isopropanol didn't do a whole lot, the
acetone loosened the grease, and with MC, the grease just completely sluiced
off.  It's good stuff.

It's also nasty stuff.  Read the MSDS if you don't believe me.  One drop on
the floor will evaporate and fill your garage with the threshhold limit value
for an 8-hour exposure.  You really need good ventilation.  I open my garage
door after I use it.  I throw the wet rags outside.  I wear the proper
chemical resistant gloves (I think) and I try not to breathe while I use it.  
Certainly I don't inhale the fumes.

Run your own test.  See how much easier it is to get grease and oil off with
MC.  Of course, acetone works, too, but you have to work a little harder.

Perhaps a comment from the factory would be in order, or perhaps someone with
a newer manual (mine's dated 1993) can tell us what's in there on this
subject.  I have heard that they've run tests which suggest some waiting
period should be used between solvent wiping and applying BID.

- Rob Wolf
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