At 08:16 1/19/2005, jimt wrote:
>a project.  4 days later it still hadnt hardened up correctly.  Even after
>an almost double amount of hardner.  Threw those tubes out and went to

Hi Jim --
Double hardener (with any epoxy) is an absolute guarantee that it will
never harden; even a few per cent extra can prevent hardening -- consider
the recommended amount as "never-exceed" and aim a bit shy of it so that
the margin of error of your measurement won't exceed the
recommendation.  If you use too little it will cure slowly, but
fully.   Too much ends up rubbery forever.  Since the hardener usually
dispenses more easily than the resin, it is very easy to get too much and
think it's equal.  I struggled with epoxy for years until my father taught
me to draw out the resin in a uniform shape and mark it for the correct
proportion (we use some stuff that's 1:5), then carefully go a bit shy of
that with the hardener.  Nary a problem since -- but I would have sworn up
down and sideways that I had the amounts correct before.  Oh...on the
syringe-type dispensers I press mostly on the resin side, and if a little
too much hardener comes I suck it back or otherwise remove it.

david

--
David Beierl - Providence RI USA -- http://pws.prserv.net/synergy/Vanagon/
'84 Westy "Dutiful Passage," '85 GL "Poor Relation"

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