One thing about CA from a hobby store vs Walmart or a hardware store is the forumla of the glue.

CA comes in many forumlas for various uses, thin for tight fitting wood joints and CA Hinges, medium and thick for gap filling (and other uses), some companies sell specifc forumlas for plastics. There are CAs that are good for people who are alergic to the fumes and that work on styrofoam with out melting it. (most CAs eat foam).