I make my own materials, I restore focal pnae and other curtain shutters and make my own shutter cloth and essentially used this for my bellows.
Originally Posted by Fragomeni
It's very simple, I use black acrylic paint to seal and make thin black material light-tight, I work it into the cloth wiping off excess - this part is important for best flexibility. I've used 4 different Acrylic paints up to now, while all are fully light-tight I prefer one variety for shutter curtains as there's better flexibility, and another for things like bellows where the finish is more silk like (as opposed to matt). I do use the matt finish on the inside of bellows. It's aslo usefull for restoring bellows.
I found you needed to look at a few website for bellows making, none was quite right, I tend to make a paper version first, and now have my patterns drwn up in CorelDraw which I just adapt as needed.
Will check out the Durst bellows in an hour or so if I can find them.