My comments are based only on feedback from here, not personal experience. Based on others' comments and also for Mike, I used Retayne on the steep twill golden and rust rivets. Haven't heard that the canvas FFs need the fixative. I had to do the manual method for the Retayne as you are not supposed to use a machine if it's an He machine. But no biggie. Just soak in hot water for 20 minutes.