Message-ID: <000b01c08baf$57a2d240$6b07bc40@flashcom.com>
From: "Marvin May" <maymarv@ucla.edu>
To: <lancair.list@olsusa.com>
References: <20010131055642.AAA8389@ns1.olsusa.com>
Subject: Re: lancair.list V1 #293
Date: Wed, 31 Jan 2001 09:57:55 -0800
Reply-To: lancair.list@olsusa.com
Mime-Version: 1.0

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Scotchbrite or something similar.
>
> On cleaning Plexi:  The most important thing is to get the dust off first,
> before you start rubbing.  Most dust is silica, which is very hard, so no
> matter what cloth or pad you use, if you start rubbing the dust around,
> you'll scratch the plexi.  A good pressure wash followed by a gentle
> sponging would be a good start.  The Novus products have worked well for
me
> for ordinary stuff.  For nasty areas, however, like a big scuff or
scratch,
> wet-sand the area starting with 400 grit, then 600.  Then use a soft
> (unstitched) cotton buffing wheel with a buffing compound specifically
made
> for plastic.  There's a blue compound that's good, available from the
> Eastwood Company (P/N 3010, 1-800-345-1178).  You need a fairly light
touch,
> as it's pretty easy to melt the plexi and make a mess.
>
>     My paint troubles now appear to be solved, but not before having
another
> headache with PPG's Delta system.  No matter what I did with it, it
> fish-eyed like crazy.  The tech reps blaimed contamination of my air
system,
> but a new filter / dryer, new hoses, and a new spray gun had no effect.  I
> switched to Imron, and have had no further problems.  Also bought a forced
> air respirator system (including a hood) from Hobbyair, which is very
nice.
> The $500 investment seemed a good trade-off for not getting poisoned with
> isocyanates.  Anyone contemplating using isocyanate-containing paints
> (mainly polyurethanes) should check out the various web sites on
isocyanate
> toxicity (CDC and others).  The paint store guys all say "Naah, no problem
.
> . . " --- don't believe it.  The charcoal-canister masks won't cut it,
> because the isocyanates are absorbed through the skin and particularly
> through your eyes.
>
> Jim Cameron, ES builder
>
> ------------------------------
>
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
zzzzzzzzzzzzzzz.
> Message-ID: <ab.5f894a0.27a863dc@aol.com>
>
> I queried Orin about this just before I bonded in the canopy plexiglass.
I
> realized that MC on the plexiglass would be bad but didn't know what to
use.
> His answer was "isopropyl alcohol".  I have found that most drugstore and
> grocery store rubbing alcohols are 70% isopropyl and 30% water, but the
stuff
> at Von's (a local grocery store) is 99% alcohol.  Read the label.  The
water
> won't hurt the plexiglass but it takes longer to dry.  Concerning what
rags
> to use -- I think Marv covered that.  I used my standard -- a cut up old
> cotton t-shirt.
>
> - Rob Wolf
>


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