I need some advise on the use of putty,
I always use the tamiya putty

and normaly I only use small amounts to fill seams.
But for the project I am working on, I need to fill larger holes and stuff. The problem I have is that the putty dries out in a couple of min. before I can put it on the model and I have to trow it away.
Is there a way to keep it soft so I can handle it a bit longer??
