Brent Everett As A Bottom

Problem with fimo fimo soft

huge problem I faced with the fimosoft.
Until a few months ago I was sure that close the rolls of polymer clay with scotch tape was the best solution manterene to the soft dough until next use ... but maybe I was wrong!
rolls of polymer clay that I use most often soft to me were always the simple fact that were completed in a few weeks ... but the cakes that I used more rarely as they are now?
They have become very hard and CAN NOT PROVIDED!
Unbelievable really ... longer than the dough balls are unused, the more time passes after their initiation, the more you harden!
While cernit has not given me any problems, I rolls unused for months that are as soft as when I purchased ...
When I transferred all the dough balls from plastic drawers where I have always kept in a tin box (as I have heard that the plastic absorbs the dampness of the dough balls) ... hopefully good!