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<< Lancair Builders' Mail List >>
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I bypassed the problem of sticky stuff dispensers turning my epoxy dark by
simply not using one. I keep my epoxy bottles (resin, fast hardener, slow
hardener) in a cardboard box on a shelf in the laundry room next to the
garage. This room is heated and air conditioned, like the rest of the house.
(The garage is not.) When I mix epoxy, I put a paper mixing cup on a
digital gram scale, pour in XX grams of resin straight from the bottle, hit
the "tare" button, and then pour in XX / 4 grams from the hardener bottle.
If a huge layup requiring pre-measured amounts is necessary -- to be mixed in
the heat of battle -- I premeasure the resin and hardener in separate cups.
About 3 grams of hardener stays in a 3 oz Dixie cup when I pour it into the
resin cup, so I increase the amount of hardener by 3 grams.
It takes about 1/2 gram of resin per ply-in2 for small layups and 1/3 gram
per ply-in2 for large layups. (A 10x10 inch 2-BID is 200 ply-in2. That's a
large layup.) This gives some leftover for brushing onto the surface before
placing wet BID sandwiches and enough for ensuring peel ply is fully wet out
-- you will eventually develop your own rule of thumb in terms of "grams of
resin per ply-in2". I may have more excess than other folks, but I hate to
run out in the middle of a layup.
The electronic digital scale cost about $100 several years ago (they're
cheaper now) and is small enough to leave on my workbench all the time. The
epoxy stays warm in winter and cool in summer. I have used sticky stuff
dispeners and they are very handy, but that was when I had a
temperature-controlled lab at work and we were mixing lots of epoxy all day
long -- not 2 or 3 small layups after dinner.
- Rob Wolf
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LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore: http://www.buildersbooks.com/lancair
Please send your photos and drawings to marvkaye@olsusa.com.
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