Below is my post from the other day. Just wanted to follow up to the numerous replies -- thanks all! I got replies in three groups (1) watch the mixing ratios (2) watch the temperature (3) you may have a bad batch. I had leftover JB in my mixing containers from the first two applications. I brought it inside (20C) and it did harden up more than it had. Unfortunately bringing the block inside the house is not an option! I mixed up another batch, weighing the quantities of resin and hardener. Left it inside overnight and it's much harder than any of the other batches. So most likely the batches I was making were too small and I got the ratios slightly wrong as a result. A perfect example of penny wise, pound foolish! I cleaned the old JB off the block. Here's what I did to mix the most current batch: 1) measure out equal amounts by weight using a scale 2) mix for 60 seconds 3) put in microwave for ~10 seconds (epoxy gets much less viscous) 4) mix for 60 seconds 5) apply 6) waited 6h. Pointed some lights at the block. Shrouded the whole thing with blankets. (It's ~5C here -- wouldn't have to do this if it were warmer!) So -- watch your mixing ratios and temperatures! If you're paranoid, mix some up beforehand as a test batch.
--tabe
--- tabe johnson <xtabe@yahoo.com> wrote: > Gooped up my corroded block yesterday. Waited 24 hours. I > put a light near the JB weld because it's been cool. > > The epoxy is still soft. When I poke it with my dental probe > it feels like a cavity as opposed to a piece of hard metal. > > How long does it take this stuff to dry? Is the ratio of > resin to hardner especially finicky? Does it need to be > mixed for an unusually long time? > > tabe johnson/87 westy/vancouver bc
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