In all the replies in here... I did not see it mentioned that you need to turn the boat over to do this. It makes all the difference in the world than trying to do it otherwise.

Something else to consider is having to walk on the hull if you are flipped over. The glass will crack at the narrowest part of the hull if there is not enough cross section. Also, how much harder was used.

I used the thin cloth to start with and then put on two layers of heavy cloth cut in strips. Then when it hardened.. I shaped it back to a V with a belt sander. Now I do not worry about walking on the hull nor beaching.