2. Slow glue flowing: the hot melt glue gun below 30W and the glue gun above 60W have a large gap in the speed of glue flowing. It is recommended to choose a high power glue gun.

3. No glue out: If the hot glue gun can heat normally, the problem is the temperature is not high enough, or the hot-melt glue stick is not in the heating place.

4. Adhesion is not firm: the viscosity of the glue stick has different grades. If the requirement of stickiness is high, please choose the high sticky glue stick.

5. Principle description: glue melting is physical changes. Solidification is as soft as glass rather than 502 glue.