I used open cell foam from the craft store, it was 24 " x 48" x 4 " for $14. I cut the rough shape out with my band saw, and the sanded it to shape with 220 sandpaper. I then coated the whole thing with spackling compound (to fill the open cells). I then wet sanded with 400 grit. Then I laid the 2 layers of fiberglass up by hand, sanding in between coats of resin (5 coats total). I did it all over a period of 2 days. It did turn out smooth, but there was some elbow grease applied. LOL

But all in all I have to say its not to shabby for my first attempt at laying up glass.