Krazy glue offers various versions of their adhesives based on the type of applicators, including gel, brush, pen, tube, etc. The applying procedure is not the same for all types. Don't worry; it's quite easy to open every kind of Krazy glue. Basically, except for the pen glue, the other variety of adhesives use the same sort of cap. You just have to open that cap to use the glue. Nothing complicated here.