All methods have their advantages and disadvantages. There are three factors to consider in the seam construction. They can be either butted or overlapped. Butted seams require more accurate cutting of the chambers and precise matching of the tubes to allow both chambers to touch each other without overlapping. This butted seam process is more labor intensive, but produces a more aesthetic flat seam with less chance for air leakage.
Overlapped seams are when a part of each chamber actually overlays the other chamber.
This process allows for more variance in the tubes and allows for quicker assembly. However, the overlapped seam is more vulnerable to air gaps, due to gap ridge between one chamber and the other. The chemical compound of the glue, has the same chemical characteristics of the fabric and thus produces a solid airtight bond. In fact, chemical engineers have tested and proven that a Hypalon and Neoprene glued seam is so strong the fabric will tear before the glued seam fails. However, the main drawback of glued boats is that they are require more labor to produce a quality seam.