Join Date: Jan 2007
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just to be a stickler, you probably mean epoxy. epoxy cures with production of heat and, especially if it is hot outside, it may begin giving off smoke or even catch fire (happened to me once). generally, once it starts getting overheated, that means it is being cooked and the resulting material will be theoretically more brittle and less strong than properly cured.
you could have quickly cooled it (dispersing it in a thin layer over a large surface like a single-use tray may help), also using slower hardener will increase its pot life in hotter temperatures.