If you are using a low temp colour or glitter glue stick, the glue may lose its colour pigments. Also, the high temperature will make your low temperature glue too liquid which will also result in a dripping glue gun.

Overview of Glue Guns:

• GG910 - High Temp (165 degrees Celsius)
• GG920 - Low Temp (105 degrees Celsius)
• GG930 - Dual Temp (105 and 165 degrees Celsius modes)
• GG940 - High Temp (165 degrees Celsius)

Overview of Glue Sticks:

• GG01 - High Temp (165 degrees Celsius) Multi-purpose Glue for use in GG910 or GG930 (High Temp mode)
• GG02 - Low Temp (105 degrees Celsius) Multi-purpose Glue for use in GG920 or GG930 (Low Temp mode)
• GG03 - High Temp (165 degrees Celsius) Wood Glue for use in GG910 or GG930 (High Temp mode)
• GG04 - Low Temp (105 degrees Celsius) Decorative Glitter Glue for use in GG920 or GG930 (Low Temp mode)
• GG05 - Low Temp (105 degrees Celsius) Decorative Colour Glue for use in GG920 or GG930 (Low Temp mode)
• GG11 - High Temp (165 degrees Celsius) Multi-purpose Glue for use in GG940
• GG13 - High Temp (165 degrees Celsius) Wood Glue for use in GG940

Depends on the usage, in general it takes about five minutes before the glue in its chamber cools down. But the Gluegun needs power to heat more glue and refill it's chamber.