From: RWolf99@aol.com
Message-ID: <58f65fd9.36b71b92@aol.com>
Date: Tue, 2 Feb 1999 10:36:50 EST
To: lancair.list@olsusa.com
Subject: Mixing Epoxy
Mime-Version: 1.0

          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> 
>>

In a message dated 2/1/99 10:00:52 PM, you wrote:

<<Another choice is to do step one above, then add the appropriate amount of
hardener to the base, but what if you add just one gram too much - or even
one tenth of a gram.  Doesn't that throw off your ratio as well?>>

This happens about one third of the time.  You just recalculate and add the
appropriate extra amount of resin.  Kinda like when you make a batch of
cookies and dump in too much flour.  You add more of the other ingredients to
match.  The only risk is that you end up with way more than you need.

By the way, I mix large enough batches that a half gram doesn't throw off the
mixture.  Minimum is usually 20 grams of epoxy, 5 grams of hardener (Jeffco).
You sneak up on the proper amount of hardener with a constant flow of the
stuff, watching the grams tick off on the scale.  That way you can convince
yourself that your hardener is midway between the amount necessary for the
switch from 4 to 5 and from 5 to 6 grams.  So you get a little more resolution
that way.

I've used epoxy pumps before -- they are convenient, for sure.  But I didn't
want to deal with the mess of setup, cleanup (of the pump) and replacement of
outdated epoxy with new.  I have no doubt that a properly set up pump will
give good results.  Whichever is more convenient for you is good.

I leave the excess in the cup on my bench to verify proper curing before
discarding. 

- Rob Wolf
rwolf99@aol.com