Both the Red Devil, and the hobby shop fillers, tend to dry out in the container after time, and as product level becomes lower in the container. I keep a spray bottle with water and a VERY fine mist setting handy in my shop. When I am finished with the filler..... I give the surface in the jar a short blast of water mist. Very little now!! I also mist it into the cap. It will bead up there, and sprayed both places, it keeps my filler product "fresh as new". ....lownslo....