I am making my sub box that will house two Alpine type r 10's and I have a few questions for the pros. How many layers of fiberglass is needed before I can finish this thing up. I have already 4 layers completed. This box is going to fit in the recessed are in the hatch so it is not that big. I just need to know when I can stop. Also what is the best way to attach the top board (baffle) to the box? Am I going to sandwich the fiberglass between the baffle and the frame with screws and then fill in any area between with a putty? Will that work ok? Or would it be better to cut the baffle to fit inside the box and then screw from the outside into the baffle and fill with putty? See the attached pictures to help you understand what I am talking about. The first picture is of the frame right before I layed the first layer of fiberglass. The second picture is of the first layer after it hardened.