sound deading material questions

I plan on using 1 of the available spray/roll on products. It will be after a good strong paint and seam sealer. After the roll on product I will likely use some good old dense fiber insulation for mass. They make insulation out of recycled denim blue jeans now that I might it a try.

Examples of roll on are Lizard skin (many vendors) and spectrum (secondskinaudio).