Yes, this is a car thread.
If MOST of car interiors were plastic, why were the more luxurious vehicles i. e. my Mustang equipped with pleather wrapped cardboard? Why not just use pleather wrapped plastic instead? Staples can go through plastic, its a proven fact. And guess what? It can't get warped from moisture! A GREAT thing for convertibles!
Whatever, I sealed my speaker grilles back on with HUGE washers on the backing screws and black roofing silicone. From the outside, they'll never know...