Put first few layers of glass on and found the contours to be a little challenge for me. I sanded it smooth after 2 layers of hair and found air bubbles. I guess it is better to find now and sand out than later. I will apply 2 more layers of hair and one final layer of weave. It is probably overkill, but for a little added weight, at least I will have strength. If anyone has any insight, I would appreciate it. Thanks.