I have used Rammat numerous times and find it superior to Dynamat and much cheaper. It doesent cut up your hands quite so bad and its more malible. It isnt as thick but a single layer is very effective and easy to apply and its thi9n enough that 2 layers where needed isnt total overkill.
I then apply ensolite, a thin foam fabric like material with spray adhesive and it absorbs even more noise. Its pretty cheap too.
RAAMaudio