Tanveer Bhai .. It is always nice to do something with your own hand ... I just thought about the volume of one kg of this rubber ... it seems it is much less dense than the Dynamat Xtreme ...
Dynamat Xtreme comes in 1.7 mm thickness .. in order to similar levels of deadening efficiency, I think you should aim for about 3 mm thick layer ... Inside the door, space is very limited to work ... so it would be a challenging DIY