[James71c10]

Hey guys. Im in the painting stage of my 71 c10 project. i had everything sandblasted and Ive got everything but the cab coated in epoxy primer. Im debating on using lizard skin sound deadener only on my cab floor, behind the gas tank, on the inner firewall by your feet and possibly on the roof inside the cab. What are your guyes reviews and opinions on this? And if i should do it how should i do it? spray it on the bare metal? or should i spray some epoxy primer first then spray the lizard skin? Any help is appreciated. Thank you