I can't get replacement element for this gun!

Yes, the difference is the air flow over the 1000 watt element, blow dryer, uses lots of air, heat gun uses a lesser airflow.

The cost of a glue gun varies between $5-$20 for a good one.
The glue gun works based on heat, in the front of the glue gun there is a heating element, once you install the glue cartridge and press the trigger the glue cartridge is pressed thru the heated element who melts the glue forcing it thru the front nozzle

No, no seal. The heating element is just a heated tube with the nozzle simply threaded into its end. The heating element in your glue gun may be cracked. Or... possibly... you (or someone in your household) got it hot and laid it down and left it that way for a LONG time, and the melted glue backed up inside the heating element. A glue gun should never be laid on its side while hot but idle, especially for long periods of time.

that's just an unfortunate side effect of gravity. it happens to all glue guns. as the element heats the glue it turn into a liquid and oozes out of the nozzle. eventually it would stop when once all the glue in contact with the element has oozed out.
check this out.
https://www.youtube.com/watch?v=3H8ZgrOaxRc

Buy a new heat gun at Harbor Freight. They are much cheaper than the new element would be if you were able to find one.

I have 4 dead MW heat guns with the same problem. The most common problem is a blown fuse in the heating element assembly which prevents the circuit from being completed. It is attached inline with the Red wire. Test the fuse with an Ohm meter, then use a jumper cable to temporarily jump the fuse. The fan and heater should then work. Replace the fuse and you will have a working heat gun

These are nothing but large resistors. If the guns have failed to heat - the cost of replacing the heat element is more than the purchase of a new unit.

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With out the thing plugged in with an OHM meter the heting element can be checked with the nose removed. Most of the time once the nose is removed the problem is easy to see the end is burnt off the element connection. Remake the connection reinstall the nose and test. The heating element runns right off the switch and the connection there is easy to see with the handle opened. This is simple unit and wires burnt off from being too hot is almost always the problem. look it over carfully and the problem will be seen.

Heating element is probably burnt out. Easy to replace. Contact www.ereplacementparts.com. They run about $56 plus shipping. Might be better off to buy a new unit...that's what I did but mine was VERY used...

Where soldering irons have a heating element that heats a copper or alloy tip; in a soldering gun, the tip is also the heating element. Most soldering guns are hot enough to solder in less than 5 seconds and cool enough to touch in less than a minute. Soldering guns are ideal for the typical home electrical job like connecting speakers or installing automotive accessories. These jobs often have only a few connections to solder so a soldering gun can be a real time saver.