Earlier in this blog I asked how artists who use gesso dealt with the "lumps and globs" that form over time in acrylic gesso. I heard about storing the container upside down - not good as the lumps still formed. I also heard about straining the gesso through cheese cloth - the gesso I use is too thick to strain through cheese cloth.
Carolina (http://loquemegustaaquiyahora.blogspot.com/) suggested using plastic food covering film (Glad Wrap or similar) on the surface of the gesso inside the container. IT WORKS! I cut a circular piece of plastic film using the lid of the container as a pattern and put it on the surface of the gesso. I've been using the same container of gesso for several weeks and NO LUMPS! I need to use gloves to handle the film, but that's OK. I also had to replace the plastic film because I let it dry out and the gesso on the film caked up and was making chips of gesso.
THANK YOU CAROLINA! You rock! (But you already knew that.) :-)
Now if someone can tell me a "safe" way to transport paintings to and from art shows. . . . . .