I used a 3M spray adhesive to glue the carpet in. This automotive carpet is real light and conformed well to the radius's in the hack.
When all was done I had enough carpet left over to completely redo the sidecar floor and enough fiber board to make two more interior panels. The carpet is quite light so I only expect it to last a couple of years.
The carpet should dry quickly when wet as it is such a light weight material. (J.C. Whitney $29.99 for a 54" X 10' piece)