Hi, The seam is not visible as you make 2 molds- s shells and you bound them together wet so the seam is the outside and doesn't show..that why these seats are a bit more pricy and the mountings have to be put inside.....here a seat I have done in fireretardent Nomex...hard to work with but try a torch to it....
...the seam
..with the bare back....
Pasha...
