A better way? to keep RTV usable.

I buy "The Right Stuff" in large caulk tubes. When I go to put it away, i insert a screw into the tip, and then put some electrical or duct tape on the tip to seal it. When i go to use it again months later, i just remove the tape, and pull the screw out. Pulling the screw dislodges any sealant that had cured inside the tip.