What noise are you trying to isolate?
I've insulated my car a lot (mainly for speakers, not done for NVH reasons) and I can't say it's made much of a difference.
In my case, the spare wheel insulation made little difference - I suspect the rear seats act like giant sound absorbers as they completely seal a large part of the area between the boot and cabin.
EDIT - Also I don't think felt is the sort of product you want to be using. You need proper products for the job.
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