CA is short for cyanoacrylate. There are different types of CA, one of them being the name brand SuperGlue. I have found that CA is offered in larger bottles than is available at Walmart and in most cases it is cheaper per ounce. I don't normally use CA for model building but when I have an application for it, I buy it in small quantities from Walmart for the simple reason that it hardens in the container, bottle or tube, before I use it all.