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Bill Tindall, E.Tn.
using a short measure of the hardener will avoid those problems.

That is because there is less cross linking reaction occurring which will lead to less than optimum properties if that is important.

It was never clear why a large volume of epoxy was being used for whatever you were doing. This application is not suitable for typical epoxy because of the large amount of heat generated by the cross linking reaction. In a large volume there is poor conduction to allow the heat to dissipate. The heat itself will lead to loss of properties. If I had a large hole to fill I would be using styrene resin to do it with a gob of cheap inert filler(Bondo).

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