You can use most any grade fiberglass you want to. I use a medium fiber for this project. Cut each of the pieces allowing just a little overhang.
Using a finishing epoxy, brush the epoxy on and press the cloth down. I use some thick grade super glue to hold the cloth down in strategic places so that it lays flat against the surface. Set it aside to cure good.
Once the epoxy has cured, trim the excess fiberglass with a knife and sand the entire surface well.
In the next chapter, we will build the circuit board box cover