John,
Are you measuring the mix ratio by weight
or volume? From your post, it sounds like you’re going by volume.
That could be the problem. Also, what’s the age of the
hardener? Is it still within the mfg’s shelf-life period? Did
the remainder of the mix left in the cup cure, or is it still soft? Its
always a good practice to keep the residue and check it with a sharp object the
following day, just to make sure it hardened properly. Have you spoken
with the manufacturer?
Mark S.
From: Rotary motors in
aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of John Downing
Sent: Thursday, January 26, 2006
1:16 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Epoxy
Question for you glass fellows. Yesterday I laid up
some cloth on the cowl and it didn't harden. I put some heat on it
with the heat lamp and left it over night and nothing. This
morning I put the heat lamp on it and pulled it off, scraped it and ground
the area, wiped it down again with acetone and tried again. The epoxy is
United Resin Corp. Uni-Lam. The shop is hot water heated with pipe in the
floor and this epoxy is supposed to work at room temperature..The ratio by
volume is 1 to 3.8, it has been working ok by using a marked stick in a
soup can, but I'm wondering if this ratio is hyper critical. Any input
would be greatly appreciated. JohnD