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Date: Sat, 06 Jan 2001 13:14:09 -0600
From: Harry League <harryleague@home.com>
Organization: @Home Network
To: lancair.list@olsusa.com
Subject: Re: Laying up Multiple Bids
References: <e6.fb4476d.27887764@aol.com>
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>>
David Jones brings up a good point that has bothered me for some time.
Invariably, bubbles are inserted into the epoxy mixture by merely stirring the
two components together.   The addition of cabosil or micro balloons only makes
the matter worse.   Some of these bubbles are quite large and others are tiny.
The big ones are relatively easy to squeegee out but there still remain the
smaller ones.

I have toyed with the idea of using a vacuum chamber to draw out the bubbles
while still in the mixing container but wonder if it is a useless exercise
because the bubbles return during the process of wetting out the BIDs and again
when using a brush for working the BIDs into position.   Has anyone else any
thoughts on this?


[Everyone has their own layup method that they feel works for them and
fits their personal comfort level.  For me, I'll do the sandwich 
method in 2-BID layers only, and only on relatively flat surfaces.
Any layups I do in tight corners are done 1-BID at a time, paper-towel blotted
thoroughly between each layer and peel-plyed only when the finished layup
will be in an accessible area.  It's a little harder to keep the
individual threads aligned properly in single BID layups, but not impossible,
and there are NO air bubbles at all when using this method.  Yes, it takes
a little longer, but there is no wondering about air entrainment in
the end product.     <Marv>   ]

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