I was going to try this on my origional trunk matt.
I bought some wide screen doors screenand a can of spray rubber like flexseal.
My plan was to tape the top side and even over the missing spots.
Turn it over and do a light spray over the back side, imbed the screen into it, then do a heavy spray over the rest.
After it cures remove the tape from the front and my hope is the missing sections will be solid and flat. There will not be any color or texture but it should be solid and hold upwith the reinforcement.