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Use the outlet closest to your work area so you can work comfortably. If your glue gun has a separate power switch, make sure it’s set to the “On” position. Give the glue gun a couple minutes to heat up before loading it. Be careful when working with an active glue gun—only grip the handle and body of the gun, never the tip. Once inside, the heating elements will begin to melt the glue. This may take several minutes.  Choose high temperature glue sticks. These provide the strongest bond for plastics, and you won’t have to worry about the glue melting in warm weather or hot working conditions.  To check to see if you’re ready to begin gluing, squeeze the trigger lightly and look for melted glue strings to emerge. Wipe off the tip of your glue gun with a thick rag before you start working with your wood. This keeps contaminants off your project and controls glue strings as you work. Press the trigger on the gun to release the glue. Concentrate the glue on the broadest, flattest areas of the objects you’re joining. Use the gun’s tapered tip to direct the glue more precisely, and don’t use more than you have to. Hot glue can burn if it come into contact with your skin. Work next to the sink or keep a cup of cold water nearby in case you happen to get any on you by accident. Move the smaller piece into position over the larger one, making sure they’re properly spaced and aligned. Hold the pieces together firmly for 30 seconds to a minute while the glue begins to set.  Test fit the pieces beforehand so you don’t make a mistake. When working with hot glue, you’ll need to work quickly to get your pieces together before the adhesive begins to dry. Hot glue dries fast, but it can take a while to fully set. For best results, leave your pieces to sit for at least 8-10 hours. By the time you check back in the morning, the glue should be for maximum hold.  A quick blast with a hair dryer can cause stray glue strings to vanish.  Should you need to separate the glued surfaces for any reason, a hair dryer on a high heat setting can also be used to melt the dried glue.
Plug in and turn on the glue gun. Load a glue stick into the backside of the gun. Apply the glue to one or both surfaces. Fit the objects together. Let the glue dry overnight.