Mixed epox­ies give off heat as the resin and hard­ener poly­mer­ize,

Old House Journal - - Restore -

and since heat ac­cel­er­ates cur­ing, the patch may cure quickly, es­pe­cially on a hot day. To mit­i­gate in these con­di­tions, keep the epoxy com­po­nents (be­fore mix­ing) in a cool place. Put mixed com­po­nents on ice, if pos­si­ble. —Ray Tschoepe

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