Screw down the wire contacts on to the bare electrical wire only and do not clamp down on the insulation of the wire. Bad contacts cause sparking which may cause the cord to heat up and may damage equipment.
Ensure your tool is completely cooled down before shutting off:
Repeatedly shutting down the tool without allowing it to cool adequately may cause the element to crack; the cracking of the ceramic element may also cause the mica tube to burn or peel.
Watch for a plugged air intake:
A plugged air intake will cause bad welds. Regularly check that the air intake is clear. Clean it with a soft brush when needed.
If a tool's heater tube gets wet:
Do not turn the heat on right away the next time the tool is started as there is a risk of damage to the element and mica tube. Run the blower or tool without heat for 10 minutes so that the moisture is safely blown off prior to slowly increasing the heat to the desired level.