To be honest with you, I would skip the gorilla pad. Mine came in today, and I was kind of disappionted. It seems to me that it is just heavy duty felt, and yes it is a cloth, that is about 1/8" thick. The pictures on most website make it look like it is thick or has some substance, it doesnt. I am not saying it will not do it's job (protecting the liner!) whick is why we intalled anyway, but if I had it to do again I would have just used styrofoam instead. In my opinion you shouldn't need to use both.

Good Luck
Chaz