question about epoxy putty

hi all,

will epoxy putty harden after it being taken out of its plastic wrap?

what if i am unable to finish up the whole putty at one modelling session, can i save it for later use?

how do i save it? put the left over in a tupperware or some air tight container?

thank guys for your advice

It won't harden until you mix two putties together. Once they're mixed, it cures by chemical reaction, so there's no way you can save it for later use.

Some brand start to harden when it's unwrapped, but that takes a long time. Just keep it in a small plastic bag or something. My epoxies are more than 2 years old, and still usable.