lowbush
Bronco Guru
I too was going to say brush it with fiberglass.. I built my trans cover out of a heavy cord board and brush on fiberglass resin. Over cord board and duck tape both.. Then I sprayed it with bed liner .. I have cut it into 3 times with the sawzall and repaired it .. It'll last forever I think.
I would also say a 2 part epoxy, just brush it down front and back, it will look nice and will last forever.