Whilst I was trawling through the archives I found this post which I want to ask a little more about as I'm kinda at this stage.
To apply or not apply sound deadener to the side of the gas tank? that is the question.
Given that I'm fresh out of paint, I've notice that deadener wasn't applied to the rear wheel wells, so don't stress I say I'm sure worse things are bound to happen along the way, so whilst researching I'm inclined to know whether to fit the gas tank in and apply deadener to the rear wheel wells, and gas tank with some deadener sprayed on the chassis rail.
p.s. not too sure why the pics in first post aren't available to view anymore, maybe the age of the post.