You may want to have some cold water nearby to cool your seal if it gets too hot, this will help the seal release from the wax. Make sure you you dry it off before you press it into the wax.
Insulated nozzle.
Standard sealing wax sticks require less reloading.
Lower temperature for delicate materials and safety.
Two finger trigger for better control.
Five foot cord.
Its a good idea to practice getting the right amount of wax on the paper before you start using your good envelopes. Practice pressing the seals too. Remember a seal does not have to be perfect.
If you have any treads of wax from the glue gun, just wait for them to harden and then brush them away.