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Posted by Don Klipstein on March 2, 2008, 7:39 pm
>Will epoxy harden in 20 degree weather? (outdoors)?
>I have a livestock tank with a tiny leak. I want to put some JB Weld
>on it. I have the quick dry stuff (supposed to dry in 5 minutes).
>It's been in the house so at least the epoxy is warm. Maybe I should
>put a hair dryer on it ourside?????
It will eventually harden.
I would go by the usual rule of doubling/halving per 10 degree C
temperature change from "usual room temperature" (20 or 25 degrees C).
20 degrees F is roughly 30 degrees C below a fairly normal room
temperature. So I would say double that 5 minutes 3 times, to 40 minutes
- and that is for it to set.
There is a longer time for the epoxy to reach full strength. I forget
now, but I think 5-minute epoxy is supposed to have close to full strength
in 2 hours. Double that 3 times, and this is 16 hours.
Epoxy cure times may depend to some extent of heating from curing, and
if cool conditions prevent curing fast enough to achieve temperature rise,
the curing may be slowed down more. Also, double time per 10 degrees C
decrease in temperature is a "1-size-fits-all" kind of a rule.
But the epoxy will fully cure as long as it has been properly mixed.
- Don Klipstein (don@misty.com)
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