Message-ID: <008f01c1cf70$90bd5ae0$a2e3de9e@colwell>
From: "Steve & Claudette Colwell" <colwell@innercite.com>
To: <lancair.list@olsusa.com>
References: <5.1.0.14.2.20020317082629.00a9fcf0@pop3.olsusa.com>    <3C962DD1.457820B2@attbi.com> <00b101c1cf0c$7e1ef600$b463e33f@ckrouse>
Subject: Re: Reagent grade acetone
Date: Tue, 19 Mar 2002 10:04:05 -0800
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Reply-To: lancair.list@olsusa.com

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Methylene Chloride vs Acetone vs Mystery Mix, will it never end?

> There is no grease in
> the building process that is used while doing layups.  And I can't imagine
> that you would have a building environment that was riddled with grease.

Oil sources in your shop: 1. Skin Oils from your hands, nose, forehead.  2.
Your Air Compresser (unless it's an oiless pump) and Pneumatic Tools are
depositing a fine mist of Oil unless you have a good filter system and run
your tools without lube.  3. Any of the above that may have occured before
you got the kit parts.

> So....what is the problem with acetone?

It is a very poor solvent for oils and it's VERY Flamable.

The problem with Mystery Mixes is they are a blend of solvents that may have
less volatile components that will not evaporate from cored areas for a long
time and could cause major bonding problems by themselves.

The case for M/C:    It is the BEST solvent for Oils and Waxes period.
Non-Flamable  Very volatile, even if you get your paper towel too wet, it
should evaporate in a worst case (cold temp, cored area, dripping
towel----you woulden't do this would you?) with a light application of a
heat gun.

M/C can attack epoxys if you get a surface so sloppy wet it penetrates
further than it needs to, so just wet 1/3 of a paper towel enough to leave a
wet edge a few inches behind the wipe.  M/C is not good for your hands or
your lungs, get Viton Gloves @ $50.62 from MSC (800) 645-7270 and ventilate
with fans, throw towels outside.

Still more of my opinions.  I think Lancair has overdesigned the bonding
areas so even a far less than optimal bond from a partly contaminated
surface or less than optimum Epoxy mixing, application, curing, etc. has not
resulted in structural failures that I am aware of.  Which translates, you
can probably use Acetone and be OK.  BUT, since we are all trying to build
these things as strong as possible...


Steve Colwell   Legacy 2K  Placerville,CA   (530) 621-3408


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