Using hot melt glue guns

What other factors may contribute to the likelihood of any harm occurring?

Pupils with behaviour difficulties :

Horseplay :

Young / less responsible pupils :

Supervising staff being distracted or being unfamiliar with the equipment :

Glue guns not subject to regular maintenance i.e. electrical P.A.T test :

Old type non 'trigger' guns in use :

Guns resting on standard work surfaces :

Operating the gun before allowing the correct temperature to be reached :

Glue guns being used in close proximity to water :