- 1). Set your hot glue gun to its lowest heat setting. This helps reduce the chance that the hot glue might burn a hole into the Styrofoam or plastic.
- 2). Apply the hot glue to the plastic surface you'd like to attach to the Styrofoam. Let cool for about three seconds.
- 3). Press the Styrofoam in place on the plastic surface. If the hot glue is too stiff for the Styrofoam to sit flush against the plastic, peel the cooled hot glue off--if you can--and try again, this time not waiting as long before placing the Styrofoam on the glue.
- 4). Weight the Styrofoam down, if necessary to achieve a tight seal with the plastic surface, with a book or simply by pressing down on it until the glue sets. This usually happens quickly, within a minute, but leaving a weight on top of the Styrofoam for about 10 minutes will help ensure the tightest seal possible.
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