Using these Convoy® RS caulk guns is a breeze. First, insert the caulk tube into the long barrel. Then, use the extra-long seal puncture pin to open the tube. Rotate the handle to adjust the position according to your work area, especially in tight spaces. Squeeze the trigger gently, and thanks to the Enhanced SST feature, you'll get a strong thrust force with little effort. When reloading a new tube, it's easy because of the long barrel. Keep in mind that these guns are ideal for thick and viscous materials. After use, clean the gun with appropriate solvents to remove any remaining caulk. Store it in a dry place to prevent rusting of the steel welded barrel. And that's all you need to know to make the most of these great caulk guns!