Using these Convoy® Plus II caulk guns is easy. First, insert the caulk tube into the long barrel. Use the seal puncture pin to open the tube. The 360 - degree rotating handle helps you get into tight spots. You can choose the right thrust system for the material you're using. When you're done, the Automatic Flow - Stop system will prevent leaks. To keep your caulk gun in good condition, clean it after each use. Wipe the barrel and the handle with a damp cloth. Avoid using abrasive materials that could damage the gun. Store it in a dry place to prevent rusting, especially since it has a steel welded barrel.