Should there be something between gas tank and trunk floor? On the straps?

When I dropped my original tank it has a black felt material that was bonded to the top of the tank, to act as a barrier between the tank and the chassis. When I went back in with the new tank, I used a sheet of construction felt (tar paper) that I bonded with a thin coat of hi-temp (black) RTV. Looked "factory." The tank straps were bare, but I did the same thing to them...a layer of the construction felt.
Norm