(Lat705) wrote:
In answer to the cracking prolem: Sure you aren't using too much
hardener?
The hardness (modulus ) usually increses with the amount of hardener.
For the
engineers: Modulus is portional to cure agent to polymer ratio.

Lou T

Epoxy isn't like polyester resin. If you use the wrong poportions, you
don't get a proper cure. Hardness is a function of the manufacturer's
formulation, not an adjustment in the mixture. Rod finishing epoxy,
like Flex-Coat is formulated to flex, and does a pretty good job of it
unless you build it up too thick. Something like 15 minute epoxy is
usually too brittle to flex when you want it too.

I know one rod builder who says you should thin the mixed flex coat
with a couple drops of MEK (Methyl-Ethyl-Keytone sp?) so you can make
a thinner coat. He usually uses 2 coats. I settle for un-thinned
flex-coat and try to put just the right amount on so I get away with
one coat.

Chas
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