Mold Max shelf life

Hi all. I've got some Mold Max 30 to do a project which has been delayed. The creation date was June, and I'm now planning on doing it January. I've been told it has a 12 month shelf life by the place I got it from, but was wondering what real world times were? More? Less?

I'm going to be travelling a long way only to find it doesn't work. None of the tubs have been opened except for a small tester tub but it's shut very tight after I did a small test piece.

Ive had it last over the twelve if its not opened, If its opened i would keep it in a cool dry place. Any humidity will make it go bad.

But one thing i would recommend is doing a small test cast before making any final parts. Just to make sure its still good