Basically, hot glue guns do not stick to very smooth areas such as silicon, wax, metal (in which also all types of material like steel, aluminum, iron much more) or greasy and as well wet surfaces such as slippery areas.
Basically, hot glue guns do not stick to very smooth areas such as silicon, wax, metal (in which also all types of material like steel, aluminum, iron much more) or greasy and as well wet surfaces such as slippery areas.