Excellent thoughts Paul and good advice, I had not thought of this possibility. Maybe small traces of contaminants or air could cause such reactions. You are right, no point in changing the ratio.

Henk

: If something was evaporating out, then it should do so with an increase in
: pressure. The bottle would expand as the gas came out of solution. Sounds
: to me like the hardener has started to polymerize (harden) on its own.
: Could be an oxiddation issue from any air in the top of the bottle, or it
: could be jsut the chemicals slowly reacting as they age. when the
: chemicals form bonds and link up, they take up a slightly smaller space.
: That could account for the shrinking you see in the contents.

: The stuff should work as long as it is a liquid and mixes with the resin. I'd
: suggest you use the regular amount, not some adjusted volume. Or, mix it
: by weight. Any hardener which has started to react may be a bit less
: potent, not more concentrated.

: PGJ