Hey got a question for the top restorers out here. I am restoring a Sierra XR4i. Completely ground up. now its almost ready for paint i need some sound dampening. The ones that are bonded on the floor and boot of the car.
Now these things are sold everywhere, but they are all small sizes like 10X10 inches. Are there bigger smooth ones that can be made to look like original?

I am not sure if i need to bond them before the paint or after. I can wax th hollow rooms better when they are not fitted.

Any tips welcome