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<< Lancair Builders' Mail List >>
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Having had the same questions concerning the shelf life of both epoxy and
fiberglass I got answers from knowledgeable sources:
Epoxy, "Indefinite life, just heat to 120-140 degrees F and stir to remove
crystals. Store in a low temp variation area close to 70 degrees F. to
minimize crystal formation." If the hardener turns dark, as it will over
time, it has no effect on the properties of the cured resin. (per Gary
Hunter the Shell Resin Answer Man at OSH 2000 Forum)
Fiberglass, The "Satin Cloth" supplied by Lancair which was probably
produced by Hexcel. Indefinite life if stored in a clean, relatively dry
place. (per a former Hexcel executive whose name escapes me for the
moment. He usually has a forum at OSH and has written a book on
composites.)
We don't want to take chances on these things and I assumed that both the
resin and glass had a critical life span, not so!
A couple of other points made by Gary Hunter were:
Use Nitrile Gloves, not Latex and Barrier Cream (from A/C Spruce) on your
arms if they are vulnerable. Carefully wipe resin off your skin and wash
with soap and water asap.
Vent your shop with an exhaust fan.
Get a 2000 x 1 Gram Capacity Scale for best accuracy (www.balances.com)
Use Dixie brand hot drink cups.
Hold the temp in your shop and materials between 70 and 80 degrees BEFORE
and 12 hours after glassing.
Post cure @ 140 degrees for 4 to 8 hours anytime before your airplane is
painted for optimum strength. Support larger sections to prevent sag or
creep.
You might also get a copy of Rutan's Video and Book on Basic Glassing from
EAA or Spruce. Steve
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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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